Boats & Streams · Question 14 · Hard
Boats & Streams question 14
The speed of a boat in still water and the speed of the stream are in the ratio 5 : 1. The boat covers 36 km downstream in 3 hours. How long will it take to cover the same distance upstream?
- 3 3/4 hours
- 5 hours
- 4 hours
- 4 1/2 hours
Answer and explanation
Answer: D. 4 1/2 hours
Explanation: Downstream speed = 12 km/h = 5s + s = 6s, so s = 2 and the boat's speed is 10. Upstream speed = 8 km/h, so the time is 36 ÷ 8 = 4.5 hours.
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