distance rate time

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DJHJA: Newbie | Next Rank: 10 Posts; Posts: 8; Joined: Mon Dec 13, 2010 3:14 pm

by DJHJA » Fri Dec 17, 2010 4:07 pm

Hey guys, can any1 help with this one?

Peter ran X meters of the 100m dash in 5 seconds, runnning at the same rate, how many
seconds will it take Peter to run Z meters of the 200M dash?

A. 5Z/X B. 5ZX C. 5X/Z D. 5/XZ E. XZ/5

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Source: Beat The GMAT — Problem Solving | Fri Dec 17, 2010 4:07 pm

Bharat: Senior | Next Rank: 100 Posts; Posts: 70; Joined: Sun Jul 22, 2007 11:43 pm; Thanked: 8 times

by Bharat » Fri Dec 17, 2010 5:02 pm

Answer: A
the dash type is irrelevant here (because Peter runs at the same rate). solve using simple speed relations:
X meters = 5 seconds
1 meter = 5/X seconds
Z meters = 5Z/X seconds.

Let me know if you have questions.

Regards,
Bharat.

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