- A17.5
- B3.5
- C17
- D18
Step-by-Step Solution
Downstream speed = 63/3 = 21 km/h, upstream = 63/4.5 = 14 km/h. Still-water speed = (21 + 14) ÷ 2 = 17.5 km/h.
Answer: A) 17.5
A motorboat covers 63 km downstream in 3 hours and the same 63 km upstream in 4.5 hours. What is its speed in still water? (answer in km/h)
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