1.

A child swims in still water at 4.5 km/hr. The river is flowing at a rate of 1.5 km/hr. Find the average speed of the child if he swims same distance upstream and downstream.

A. 3 km/hr
B. 3.5 km/hr
C. 4 km/hr
D. 6 km/hr
Answer» D. 6 km/hr


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