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A swimmer can swim downstream at 13 km/h and upstream at 7 km/h. Find the speed of swimmer in still water.

A6 km/h

B20 km/h

C10 km/h

D8 km/h

Answer:

C. 10 km/h

Read Explanation:

Let speed of swimmer in still water is S and speed of current is C S + C = 13 S - C = 7 S=[13+7]/2 =10


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