- A15
- B10
- C12
- D8
Step-by-Step Solution
Downstream speed = 15 km/h, upstream speed = 5 km/h; still water speed = (15 + 5)/2 = 10 km/h.
Answer: B) 10
A boat covers 30 km downstream in 2 hours and 20 km upstream in 4 hours. Find the speed of the boat in still water in km/h.
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