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Length of the train

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Affiliations: IIBA
Joined: 04 Sep 2010
Posts: 61
Location: India
Schools: HBS, Stanford, Stern, Insead, ISB, Wharton, Columbia
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Length of the train [#permalink] New post 15 Jun 2011, 21:32
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A train crosses a bridge of length 500 m in 40 seconds and a lamp post on the bridge in 15 seconds. What is the length of the train in metres?

A. 375 m

B. 750 m

C. 250 m

D. 800 m

E. 300 m
[Reveal] Spoiler: OA

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Re: Length of the train [#permalink] New post 15 Jun 2011, 22:06
soaringAlone wrote:
A train crosses a bridge of length 500 m in 40 seconds and a lamp post on the bridge in 15 seconds. What is the length of the train in metres?

A. 375 m

B. 750 m

C. 250 m

D. 800 m

E. 300 m


E it is
Let the speed of the train be X
to cross a lamp = X/15...................1

to cross a bridge = X+500/40..........................2

equate both 1 and 2

X/15= X+500/40
40X=15X+7500
35X=7500
X= 300
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Re: Length of the train [#permalink] New post 15 Jun 2011, 22:15
(l+500)/40 = l/15

l=300 E
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Re: Length of the train   [#permalink] 15 Jun 2011, 22:15
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