Length of the train

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Length of the train [#permalink]

15 Jun 2011, 22:32

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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]

15 Jun 2011, 23:06

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]

15 Jun 2011, 23:15

(l+500)/40 = l/15

l=300 E
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Re: Length of the train [#permalink] 15 Jun 2011, 23:15

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Length of the train

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