- A9 km/h
- B6 km/h
- C12 km/h
- D3 km/h
Step-by-Step Solution
Downstream speed = 36/3 = 12 km/h; upstream speed = 36/6 = 6 km/h. Still-water speed = (12 + 6)/2 = 9 km/h.
Answer: A) 9 km/h
A boat covers 36 km downstream in 3 hours and returns the same 36 km upstream in 6 hours. What is the speed of the boat in still water?
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