- A9 km/h
- B12 km/h
- C6 km/h
- D10 km/h
Step-by-Step Solution
Let and . Solving gives , so and still water = 9 km/h.
Answer: A) 9 km/h
A launch goes 36 km downstream and 18 km upstream in 6 hours. It also goes 24 km downstream and 30 km upstream in 7 hours. What is its speed in still water?
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