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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. ?
    1. 15 km/h
    2. 18 km/h
    3. 3 km/h
    4. 12 km/h
Correct Option: A

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


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