Why is t=4? This time is to cross the river but why are we taking the same time?

Dear Student,
The time t=4 h is the time taken to cross the river and drift is given as distance covered in x-direction in the water due to velocity of river in the duration of time t taken to cross the river. So, as man takes 4h to cross the river and here velocity of river is 3 kmph in x-direction, so drift will be given by time t × velocity of river with respect to ground.


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