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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.?

15 km/h
18 km/h
3 km/h
12 km/h

Correct Answer: 15 km/h

Explanation:

Speed downstream = Swimmer'S speed in still water + Rate of stream
= 9 + 6 = 15 km/h

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