- A13.5
- B4.5
- C9
- D18
Step-by-Step Solution
Downstream = 45/2.5 = 18 km/h, upstream = 45/5 = 9 km/h. Still-water speed = (18 + 9)/2 = 13.5 km/h.
Answer: A) 13.5
A motorboat goes 45 km downstream in 2.5 hours and comes back the same 45 km upstream in 5 hours. What is its speed in still water (in km/h)?
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