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A man rows at 5 km/h in still water and at 3.5 km/h against the current. Find his rate along (with) the current.

Difficulty: Easy

8.5 km/hr
6.5 km/hr
6 km/hr
4.25 km/hr
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Correct Answer: 6.5 km/hr

Explanation:

Solution:
Against: b − s = 3.5 with b = 5 ⇒ s = 1.5. Thus with current: b + s = 5 + 1.5 = 6.5 km/hr.

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