Question

A swimmer swims from point X upstream for 4 minutes. Then he turns and swims downstream for 4 minutes and reaches point Y. If the distance between X and Y is 160 meters, find the speed of the stream in km/hr.

A 1.2 km/hour
B 2.5 km/hour
C 3.5 km/hour
D 7.5 km/hour
E None of these
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