DS: Speed of Train

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rsruparelia: Newbie | Next Rank: 10 Posts; Posts: 7; Joined: Fri Sep 25, 2009 7:22 pm

by rsruparelia » Sun Sep 27, 2009 12:49 pm

What is the speed of the train?
1). The train crosses a tree in 13 seconds
2). The train crosses a platform of length 250 meters in 27 seconds.

Answer: C

Any clue?

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Source: Beat The GMAT — Data Sufficiency | Sun Sep 27, 2009 12:49 pm

takegmat2010: Junior | Next Rank: 30 Posts; Posts: 16; Joined: Wed Aug 12, 2009 9:29 am

by takegmat2010 » Sun Sep 27, 2009 5:05 pm

Statement (1) => Train crosses a tree in 13 seconds. So if the speed of the train is v and length of the train is L then

L/v = 13 seconds

This statement alone is not sufficient to solve for v

Statement (2) => Train crosses a platform of Length 250 meters in 27 seconds which means

(L+250metres) / v = 27 seconds,

This statement alone again is not sufficient to solve for v

But both statements combined are sufficient

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