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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
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Joined: 02 Sep 2009
Posts: 58434
A train crosses a person in 15 seconds and a bridge of 120 meters in 4  [#permalink]

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New post 28 Jan 2019, 04:20
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A
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C
D
E

Difficulty:

  55% (hard)

Question Stats:

62% (02:12) correct 38% (02:29) wrong based on 63 sessions

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GMAT Club Legend
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Joined: 18 Aug 2017
Posts: 5022
Location: India
Concentration: Sustainability, Marketing
GPA: 4
WE: Marketing (Energy and Utilities)
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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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New post 28 Jan 2019, 06:15
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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Joined: 18 Jan 2019
Posts: 28
Re: A train crosses a person in 15 seconds and a bridge of 120 meters in 4  [#permalink]

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New post 04 Mar 2019, 07:35
Archit3110 wrote:
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


How come you assumed that the speeds at which the train crossed the man and the bridge are equal?
GMAT Club Legend
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User avatar
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Joined: 18 Aug 2017
Posts: 5022
Location: India
Concentration: Sustainability, Marketing
GPA: 4
WE: Marketing (Energy and Utilities)
GMAT ToolKit User Premium Member
Re: A train crosses a person in 15 seconds and a bridge of 120 meters in 4  [#permalink]

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New post 04 Mar 2019, 10:01
1
Ish1996
unless not given specifically in question that there is an increase in speed of train after it crosses man, we cannot consider any increase in speed of train ,hence the speed of train is considered the same while solving the question.
Hope this helps.

Ish1996 wrote:
Archit3110 wrote:
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


How come you assumed that the speeds at which the train crossed the man and the bridge are equal?
GMAT Club Bot
Re: A train crosses a person in 15 seconds and a bridge of 120 meters in 4   [#permalink] 04 Mar 2019, 10:01
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A train crosses a person in 15 seconds and a bridge of 120 meters in 4

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