A train, 240 m long, crosses a man walki...

A train, 240 m long, crosses a man walking along the line in opposite direction at the rate of 3 kmph in 10 seconds. The speed of the train is `63\ k m p h` b. `75\ k m p h` c. `83. 4\ k m p h` d. `86. 4\ k m p h`

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