Boats & Streams · Question 10 · Medium
Boats & Streams question 10
A boat's speed in still water is 10 km/h and the stream's speed is 2 km/h. What is the boat's average speed for a round trip between two points on the river?
- 9 km/h
- 8.4 km/h
- 9.6 km/h
- 10 km/h
Answer and explanation
Answer: C. 9.6 km/h
Explanation: Downstream 12 km/h, upstream 8 km/h. Average speed for equal distances = 2 × 12 × 8/(12 + 8) = 192/20 = 9.6 km/h.
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