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Thread: Misc solve this problem

post 1619892331 10-20-2020, 10:13 AM
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Misc solve this problem

For whatever reason, my friend is unable to drive. Every Saturday, I leave at the same time and pick him up at his house at 7:00pm on the dot, then drive us back to my house to watch the game.

One Saturday, he decides to leave his place at 6pm and walk along the route I take to get him. As I’m driving, I meet him at one point, pick him up, and we both get back to my house....20 minutes earlier than usual. Assume I always drive at the same constant speed (somehow). The driving is always along the same route.

How much time did my friend spend walking? Is this even possible to figure out?
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post 1619892461 10-20-2020, 10:15 AM
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post 1619892761 10-20-2020, 10:19 AM
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Yes if he walks at a constant speed, if you know that speed, if you know the distance between his house and yours and if you know the exact distance from his house you pick him up...

Edit: sorry missed the 20 mins earlier than normal bit. If you divide that 20 minutes earlier than normal into 2 you have picked him up a 10 minute drive from his house (assuming you normally spend 0 minutes actually at his house picking him up and you don't even slow down to pick him up lol). work out the distance you drive in 10 minutes. If you know his walking speed you can work out the time it takes him to cover that distance
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post 1619892961 10-20-2020, 10:22 AM
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I’ve done the boats crossing the river version. Took me less than 2 minutes.
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post 1619893051 10-20-2020, 10:23 AM
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Originally Posted By snailsrus⏩
Depends how fast you are driving

20 minutes on the freeway with no traffic is much different than side streets with stop lights and signs
Originally Posted By AlexSays⏩
Yes if he walks at a constant speed, if you know that speed, if you know the distance between his house and yours and if you know the exact distance from his house you pick him up...
Not needed. All that’s assumed is I’m always driving at the same constant speed, as given in the problem.
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post 1619893091 10-20-2020, 10:24 AM
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There's too many unknowns. Assuming you drive at the same speed that your friend walks then we'd know he walked for 10 minutes but the problem makes no mention of this.

Edited 20 minutes to 10 minutes.
post 1619893131 10-20-2020, 10:24 AM
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Originally Posted By numberguy12⏩
Not needed. All that’s assumed is I’m always driving at the same constant speed, as given in the problem.
See my edit
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post 1619893221 10-20-2020, 10:25 AM
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Originally Posted By AlexSays⏩
See my edit
Still not needed
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post 1619893491 10-20-2020, 10:27 AM
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Best thread: http://forum.obnoxiousbrutes.com/showthread.php?t=168274783
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post 1619893521 10-20-2020, 10:27 AM
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Originally Posted By numberguy12⏩
Still not needed
The edit replaces the original answer

I think unless you mention at what time you normally leave or the speed at which he walks then there is one too many unknowns to collapse this down to a solution. Your normal arrival time is irrelevant unless you have another moment in time in your journey to relate it to. All you can say is that he has been walking for the amount of time it takes him to walk the same distance it takes you 10 minutes to drive
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post 1619893841 10-20-2020, 10:31 AM
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D = Driving Speed
W = Walking Speed

D/W * 20 = Total Minutes spent walking
post 1619893911 10-20-2020, 10:31 AM
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who fkn cares.
post 1619893961 10-20-2020, 10:32 AM
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Damn never mind!!!

He's been walking for 50 minutes

got there in the end

Solution:

He starts at 6pm, you normally collect at 7. You arrive home 20 minutes early so the combined journey saved is 10 minutes each way. Therefore you pick him up at 6:50
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post 1619894071 10-20-2020, 10:33 AM
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Ass, gas or grass. No one rides for free.
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post 1619894101 10-20-2020, 10:33 AM
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so why can't your cash **** drive ?
post 1619894391 10-20-2020, 10:36 AM
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Originally Posted By bench900⏩
D = Driving Speed
W = Walking Speed

D/W * 20 = Total Minutes spent walking
Actually you'd have to factor in that he'd have to drive past the pick up point to his house and then back to that pick up point. He'd have walked for 10 minutes.
post 1619894801 10-20-2020, 10:40 AM
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Stopped reading at "unable do drive". Would neg irl.
post 1619894871 10-20-2020, 10:41 AM
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You never left. Your drive normally takes twenty minutes round trip. It took him an hour to walk.
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post 1619895211 10-20-2020, 10:45 AM
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He left at 6. You spend 20 fewer mins at a constant speed. You usually get to his house at 7. You arrived 20 min earlier than usual. This means u saved 10 min going and coming back. You found him at 6:50. He walked for 50 mins. (Assuming standing still or just being out there counts as walking.)

There's actually no way to tell if we mean walking. He could be a really fast walker, and then he could have sat down and waited for you for a while.
post 1619895261 10-20-2020, 10:45 AM
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Your friend?
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post 1619895471 10-20-2020, 10:46 AM
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Originally Posted By rectifryer⏩
You never left. Your drive normally takes twenty minutes round trip. It took him an hour to walk.
He said he always leaves at the same time.
post 1619895481 10-20-2020, 10:46 AM
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I overcomplicated this way too much(speed/distance are completely irrelevant) to start and googled a similar problem, feel so dumb knowing the answer now.
post 1619895601 10-20-2020, 10:47 AM
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Originally Posted By AlexSays⏩
Damn never mind!!!

He's been walking for 50 minutes

got there in the end

Solution:

He starts at 6pm, you normally collect at 7. You arrive home 20 minutes early so the combined journey saved is 10 minutes each way. Therefore you pick him up at 6:50
I think this is right provided we assume the guy never stops walking.
post 1619895771 10-20-2020, 10:49 AM
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Originally Posted By Motiviert⏩
350
I think this is correct
I know who I am. And after all these years, there’s a victory in that.

All liberals deserve death

*Proud member of the misc 767 & USA vs. Germany world cup ban
-People who say money can't buy happiness, have never paid the adoption fee at the pound and went home with a new best friend
*There's no such thing as a bad dog, only a bad dog owner

If you see myself and swoleyo in a thread, remind me to rep him.
post 1619895801 10-20-2020, 10:49 AM
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post 1619895891 10-20-2020, 10:51 AM
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Going with 50 minutes
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post 1619896081 10-20-2020, 10:52 AM
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Originally Posted By AlexSays⏩
Damn never mind!!!

He's been walking for 50 minutes

got there in the end

Solution:

He starts at 6pm, you normally collect at 7. You arrive home 20 minutes early so the combined journey saved is 10 minutes each way. Therefore you pick him up at 6:50
Originally Posted By trump17x6⏩
He left at 6. You spend 20 fewer mins at a constant speed. You usually get to his house at 7. You arrived 20 min earlier than usual. This means u saved 10 min going and coming back. You found him at 6:50. He walked for 50 mins. (Assuming standing still or just being out there counts as walking.)

There's actually no way to tell if we mean walking. He could be a really fast walker, and then he could have sat down and waited for you for a while.
This is correct, he has been walking (or “out there”) for 50 minutes. Reps
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post 1619896221 10-20-2020, 10:54 AM
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Originally Posted By trump17x6⏩
He said he always leaves at the same time.
I'm not picking up his bitch ass.

The key is just realizing any time saved is round trip lol.
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post 1619897421 10-20-2020, 11:07 AM
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Originally Posted By numberguy12⏩
This is correct, he has been walking (or “out there”) for 50 minutes. Reps
Lol so simple its almost too obvious to see
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post 1619897741 10-20-2020, 11:10 AM
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20 min less driving, so 10 min each way on the round trip.

You picked him up at 6:50, and he left at 6. 50 min.
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