Boats & Streams · Question 19 · Easy
A swimmer covers 2 km downstream in 15 minutes. If the current flows at 2 km/h, what is the swimmer's speed in still water?
- 8 km/h
- 4 km/h
- 10 km/h
- 6 km/h
Answer and explanation
Answer: D. 6 km/h
Explanation: Downstream speed = 2 ÷ (1/4) = 8 km/h. Still-water speed = 8 − 2 = 6 km/h.
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