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Q.

A train of length 100 m travelling at a speed of 20 m/s overtakes another train of length 300 m travelling at a speed 10m/s in the same direction The time taken by the first train to pass the second train is ----------(in sec)

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answer is 40.

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Detailed Solution

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time to overtake 

t=L1+L2v1-v2=40010=40 sec

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