Latest GENPACT Aptitude Question SOLUTION: A train travellin 48 kmph completely crosses another train having half its length and travelling in opposite direction at 4 kmph,in 12 seconds.It also passes a railway platform in

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(#M40005201) GENPACT question Problem on trains Keep an EYE

A train travellin 48 kmph completely crosses another train having half its length and travelling in opposite direction at 4 kmph,in 12 seconds.It also passes a railway platform in 45 seconds.The length of the platform is
a)400 m b)450 m c)560 m d)600 m

Asked In GENPACT (12 years ago)

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dipankar.k.s.v.m@gmail.com  (4 years ago)

Let the length of the first train be x metres.

Then, the length of the second train is ( x ( metres.
2
Relative speed = (48 + 42) kmph = ( 90 x 5 ( m/sec = 25 m/sec.
18
Therefore [x + (x/2)] = 12 or 3x = 300 or x = 200.
25 2
Therefore Length of first train = 200 m.

Let the length of platform be y metres.

Speed of the first train = ( 48 x 5 ( m/sec = 40 m/sec.
18 3
Therefore (200 + y) x 3 = 45
40
=> 600 + 3y = 1800

=> y = 400 m.

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