- A12.5
- B2.5
- C15
- D10
Step-by-Step Solution
Downstream speed = 60/4 = 15 km/h; upstream = 60/6 = 10 km/h. Still-water speed = (15 + 10)/2 = 12.5 km/h.
Answer: A) 12.5
A ferry on the Hooghly covers 60 km downstream in 4 hours and the same 60 km upstream in 6 hours. What is its speed in still water, in km/h?
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