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A man rows with the stream at 11 km/h and against the stream at 8 km/h. Find the speed of the stream.

Difficulty: Easy

3 km/hr
9.5 km/hr
1.5 km/hr
6 km/hr
—

Correct Answer: 1.5 km/hr

Explanation:

Solution:
s = (down − up)/2 = (11 − 8)/2 = 1.5 km/hr.

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