- A5 km/h
- B10 km/h
- C25 km/h
- D50 km/h
Step-by-Step Solution
Stream speed = (downstream − upstream) ÷ 2 = (30 − 20) ÷ 2 = 5 km/h. Taking the full difference 10 km/h is the usual slip.
Answer: A) 5 km/h
A ferry on the Brahmaputra moves at 30 km/h with the current and 20 km/h against it. How fast does the river flow?
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