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# A train crosses a person in 15 seconds and a bridge of 120 meters in 4

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Math Expert
Joined: 02 Sep 2009
Posts: 53066
A train crosses a person in 15 seconds and a bridge of 120 meters in 4  [#permalink]

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28 Jan 2019, 03:20
00:00

Difficulty:

45% (medium)

Question Stats:

65% (01:56) correct 35% (02:42) wrong based on 23 sessions

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A train crosses a person in 15 seconds and a bridge of 120 meters in 40 seconds. What is the length of the train?

A. 100m

B. 85m

C. 75m

D. 72m

E. 70m

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Re: A train crosses a person in 15 seconds and a bridge of 120 meters in 4  [#permalink]

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28 Jan 2019, 05:15
Bunuel wrote:
A train crosses a person in 15 seconds and a bridge of 120 meters in 40 seconds. What is the length of the train?

A. 100m

B. 85m

C. 75m

D. 72m

E. 70m

let length of train be x
so
speed of man crossing x/15
and bridge ; x+120/40
x/15 = x+120/40
solve for x
we get 72 m
IMO D
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Re: A train crosses a person in 15 seconds and a bridge of 120 meters in 4   [#permalink] 28 Jan 2019, 05:15
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# A train crosses a person in 15 seconds and a bridge of 120 meters in 4

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