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A man goes downstream 60 km and upstream 20 km, taking 4 hrs each. What is the velocity of current?
4 km/hr
8 km/hr
6 km/hr
5 km/hr
Downstream speed = 60/4 = 15 km/hr Upstream speed = 20/4 = 5 km/hr Velocity of stream = (15-5)/2 = 5 km/hr
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