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Question

The width of a river is 5 m and in it, water is flowing with a speed of 4 m/min. A boatman is standing on the bank of the river. He wants to sail the boat to a point at the other bank which is directly opposite to him, In what time will he cross the river, if he can sail the boat at 8m/min, relative to the water?

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Solution

The correct option is **A** 0.72 min

vnet=√82−42=√64−16=√48t=dvnet=5√48=0.72 min

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