1.

A 120 m long train is moving in a direction with a speed of 20ms^(-1). Another train (130m long) moving with 30ms^(-1) in the opposite directon crosses the first train in a time

Answer»

36 s
30 s
6 s
5 s

Solution :Required time = `("TOTAL length of trains")/(v_(1)+v_(2))`, as trains are moving in OPPOSITE directions.
= `(120+130)/(20+30)`
`=(250)/(50)`
=5 sec


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