- A10.5
- B3.5
- C12
- D9
Step-by-Step Solution
Downstream = 42/3 = 14 km/h; upstream = 42/6 = 7 km/h. Still-water speed = (14 + 7)/2 = 10.5 km/h.
Answer: A) 10.5
Going downstream, a ferry covers 42 km in 3 hours; coming back upstream, the same 42 km takes 6 hours. What is the ferry's speed in still water (in km/h)?
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