- A6 km/h
- B7.5 km/h
- C5 km/h
- D2.5 km/h
Step-by-Step Solution
Downstream speed = 20/2 = 10 km/h; upstream speed = 20/4 = 5 km/h. Still-water speed = (10 + 5) ÷ 2 = 7.5 km/h.
Answer: B) 7.5 km/h
A boat covers 20 km downstream in 2 hours and returns the same distance upstream in 4 hours. What is the speed of the boat in still water?
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