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  4. A river 2 km wide is flowing at the rate of 2 km / h. A boatman, can row the boat at a speed of 4 km / h in still water, goes a distance of 2 km upstream and then comes back. The time taken by him to complete his journey is

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Q. A river $2 km$ wide is flowing at the rate of $2 km / h$. A boatman, can row the boat at a speed of $4 km / h$ in still water, goes a distance of $2 km$ upstream and then comes back. The time taken by him to complete his journey is

Motion in a Straight Line

Solution:

The velocity of upstream is $(4-2) km / h$ and downstream is $(4+2) km / h$.
$\therefore $ Total time taken $=\frac{2 km }{2 km / h }+\frac{2 km }{6 km / h }=80$ minutes