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28 Jan 2019, 04:20
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Difficulty:
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67% (01:59) correct
33%
(02:07)
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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
A. 100m
B. 85m
C. 75m
D. 72m
E. 70m
28 Jan 2019, 06:15
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Bunuel
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
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
04 Mar 2019, 07:35
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Archit3110
Bunuel
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
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?
