- A10
- B3
- C11
- D8
Step-by-Step Solution
Downstream = 39 ÷ 3 = 13 km/h, upstream = 14 ÷ 2 = 7 km/h. Still-water speed = (13 + 7) ÷ 2 = 10 km/h.
Answer: A) 10
A boat goes 39 km downstream in 3 hours and 14 km upstream in 2 hours. Find its speed in still water, in km/h.
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