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1. |
If the speed of swimmer in still water is 9 km/h. Find the downstream speed of the swimmer, when the river is flowing with the speed of 6 km/h. ? |
A. | 15 km/h |
B. | 18 km/h |
C. | 3 km/h |
D. | 12 km/h |
Answer» B. 18 km/h | |