- A11.5
- B2.5
- C12
- D11
Step-by-Step Solution
Downstream speed = 42/3 = 14 km/h; upstream speed = 18/2 = 9 km/h. Still-water speed = (14 + 9)/2 = 11.5 km/h.
Answer: A) 11.5
A motorboat goes 42 km downstream in 3 hours and 18 km upstream in 2 hours. What is its speed in still water? (km/h)
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