- A10.5 km/h
- B9 km/h
- C12 km/h
- D4.5 km/h
Step-by-Step Solution
Upstream = 60 ÷ 10 = 6 km/h. Downstream = km/h. Still water = km/h.
Answer: A) 10.5 km/h
Upstream, a boat needs 10 minutes for every kilometre; downstream it covers 2.5 km in 10 minutes. What is its speed in still water?
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