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Subject :IMO    Class : Class 8

A train of length 600 m moving with the speed 144 km/hr crosses another train moving in opposite direction at the speed 240 km/hr in 15 seconds. Find the length of second train.

A1000 m
B700 m
C900 m
D1200 m

can't under stand..... plz anyone?

Ans 1:

Class : Class 8
Add up the speeds and multiply with time as trains are in opposite directions.Then subtract the length of the first train. Ans -1000m

Ans 2:

Class : Class 8

Ans 3:

Class : Class 8
Relative velocity of two trains is 384km/hr=320/3 m/sec. Therefore,it can travel 1600m in 15 sec. Therefore, the length of the second train is (1600-600)m=1000m

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