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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 | |