- A9 km/h
- B6 km/h
- C12 km/h
- D4.5 km/h
Step-by-Step Solution
Speeds are inversely proportional to times: : 2 = 2 : 1. So ; (twice the stream) gives . Still water = 9 km/h.
Answer: A) 9 km/h
Over the same stretch, a boat takes 4 hours upstream and 2 hours downstream. If the stream flows at 3 km/h, what is the boat's speed in still water?
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