1.

            The speed of a boat is 5 km/h in still water. It crosses a river of width 1 km along the shortest possible path in 15 minutes. The velocity of the river water is                     [IIT 1988; CBSE PMT 1998, 2000]

A.             1 km/h
B.                                         3 km/h
C.             4 km/h
D.                                         5 km/h
Answer» C.             4 km/h


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