Question

Two trains travelling at 48kmph completely crosses another train having half it's length and travelling in opposite direction at 42kmph,in 12 seconds. It also passes a railway platform in 45 seconds. Find the length of the platform?​

Answer 1

Answer:

Let the length of the first train be x metres.

Then, the length of the second train is (

2

x

) metres.

Relative speed =(48+42)kmph=(90×

18

5

)m/sec=25m/sec

∴

25

[x+(x/2)]

=12 or

2

3x

=300 or x=200

∴ Length of first train = 200 m

Let the length of platform be y metres.

Speed of the first train =(45×

18

5

)m/sec=

3

40

m/sec

∴(200+y)×

40

3

=45

⇒600+3y=1800

⇒y=400m

Explanation:

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