- A12 km/h
- B4 km/h
- C10 km/h
- D13 km/h
Step-by-Step Solution
Downstream = 40/2.5 = 16 km/h, upstream = 40/5 = 8 km/h. Still water = (16 + 8)/2 = 12 km/h.
Answer: A) 12 km/h
On the Brahmaputra, a ferry covers 40 km downstream in 2.5 hours and the same 40 km upstream in 5 hours. Find the speed of the ferry in still water.
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