- A9
- B8
- C10
- D3
Step-by-Step Solution
Downstream speed = 36/3 = 12 km/h, upstream = 24/4 = 6 km/h. Boat speed = (12 + 6)/2 = 9 km/h (the stream is (12 − 6)/2 = 3 km/h).
Answer: A) 9
A motorboat covers 36 km downstream in 3 hours and 24 km upstream in 4 hours. What is its speed in still water? (answer in km/h)
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