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A man rows downstream at 14 km/h and upstream at 9 km/h. Find his rate in still water.

Difficulty: Easy

5 km/hr
23 km/hr
11.5 km/hr
None of these of these
—

Correct Answer: 11.5 km/hr

Explanation:

Solution:
b = (down + up)/2 = (14 + 9)/2 = 11.5 km/hr.

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