- A10.5
- B1.5
- C12
- D9
Step-by-Step Solution
Downstream speed = 36/3 = 12 km/h; upstream speed = 36/4 = 9 km/h. Still-water speed = (12 + 9)/2 = 10.5 km/h.
Answer: A) 10.5
A houseboat goes 36 km downstream in 3 hours and comes back the same 36 km upstream in 4 hours. What is its speed in still water (in km/h)?
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