- A12 km/h
- B15 km/h
- C9 km/h
- D3 km/h
Step-by-Step Solution
With and . Multiply the first by 4 and the second by 3: ⇒ , still water = 12 km/h.
Answer: A) 12 km/h
A launch goes 27 km upstream and 45 km downstream in 6 hours, and also 36 km upstream and 30 km downstream in 6 hours. What is its speed in still water?
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