Boats & Streams · Question 15 · Hard
Boats & Streams question 15
A boat with a still-water speed of 8 km/h takes three times as long to go a certain distance upstream as to go the same distance downstream. What is the speed of the stream?
- 2 km/h
- 4 km/h
- 16/3 km/h
- 6 km/h
Answer and explanation
Answer: B. 4 km/h
Explanation: Upstream time is 3 times downstream time, so 8 + s = 3(8 − s). This gives 4s = 16, so s = 4 km/h.
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