- A2
- B10
- C9
- D12
Step-by-Step Solution
Downstream = 36 ÷ 3 = 12 km/h, upstream = 36 ÷ 4.5 = 8 km/h. Still water = (12 + 8)/2 = 10 km/h.
Answer: B) 10
A boat goes 36 km downstream in 3 hours and comes back the same 36 km upstream in 4.5 hours. What is its speed in still water (in km/h)?
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