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M08 #18 - Bus intervals

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Senior Manager
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Joined: 17 Apr 2013
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Concentration: Entrepreneurship, Leadership
Schools: HBS '16
GMAT Date: 11-30-2013
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Re: M08 #18 - Bus intervals [#permalink] New post 23 Aug 2013, 05:43
Bunuel wrote:
ykaiim wrote:
My approach was different.

If in 12 min a bus overtakes the cyclist, while in 4 min they both cross each other. So, at the end of 12th min, the overtaking bus will meet the 3rd bus coming from the opposite side, which means there are 2 buses gone in the 12 min time period.

We are given speeds of buses and cyclist constant. So, in 12 min, if two buses passes at an interval of 6 min.


What would be the answer with your approach if it were 2 minutes instead of 4?


the answer is 4 here, it has asked time interval between two buses, first bus will meet at 8th min, and 2nd bus will meet at 12th min, so difference is 4 minutes...

Relative velocity concept, cyclist speed is assumed to be 0.

Buses speed are constant, so first bus will met at 8th min, second at 4th minutes. difference is 4 Min.
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Re: M08 #18 - Bus intervals [#permalink] New post 26 Aug 2013, 08:20
Guess, mentioning that the two buses move with same speed would be quite necessary
Re: M08 #18 - Bus intervals   [#permalink] 26 Aug 2013, 08:20
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M08 #18 - Bus intervals

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