Boats & Streams · Question 20 · Easy
A boat's downstream speed is 1.5 times its upstream speed. If its upstream speed is 8 km/h, what is its speed in still water?
- 9 km/h
- 12 km/h
- 2 km/h
- 10 km/h
Answer and explanation
Answer: D. 10 km/h
Explanation: Downstream speed = 1.5 × 8 = 12 km/h. Still-water speed = (12 + 8)/2 = 10 km/h.
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