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# There are three sprinters on a racetrack. How much time will

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Manager
Joined: 13 Apr 2008
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There are three sprinters on a racetrack. How much time will [#permalink]  19 Jun 2008, 03:32
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There are three sprinters on a racetrack. How much time will it take all three to finish an 800 meters race?

(1) The first runner can run the fastest, he runs at a 110% of the slowest runner.

(2) The slowest runner runs at a constant speed of 7 meters per second.
Director
Joined: 12 Apr 2008
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Location: Eastern Europe
Schools: Oxford
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Re: DS-Sprinters [#permalink]  19 Jun 2008, 05:47
I think it should be B – from there, we can say the time it will take the slowest sprinter finish the race. And we don’t need any info about other sprinters because all sprinters will finish the race in the same time the slowest one will finish.
SVP
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Re: DS-Sprinters [#permalink]  19 Jun 2008, 13:09
good catch. I went with E ... I thought we needed to figure out the time for each sprinter to finish ... shoot !
Manager
Joined: 14 Jun 2007
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Location: Vienna, Austria
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Re: DS-Sprinters [#permalink]  19 Jun 2008, 21:39
good catch indeed... went for E as well...
CEO
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Re: DS-Sprinters [#permalink]  20 Jun 2008, 02:59
B here

Typical C trap. Once you know the slowest runner's speed, you know how much time it will take all 3 to finish.
Value wrote:
There are three sprinters on a racetrack. How much time will it take all three to finish an 800 meters race?

(1) The first runner can run the fastest, he runs at a 110% of the slowest runner.

(2) The slowest runner runs at a constant speed of 7 meters per second.
VP
Joined: 18 May 2008
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Re: DS-Sprinters [#permalink]  20 Jun 2008, 03:11
Hmmmmm a nice one. i also went for E initially thinking we will need the speed of all the three.
Re: DS-Sprinters   [#permalink] 20 Jun 2008, 03:11
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