- A5
- B4.2
- C3.5
- D6
Step-by-Step Solution
Downstream 14 km/h: 21/14 = 1.5 h. Upstream 6 km/h: 21/6 = 3.5 h. Total = 5 hours.
Answer: A) 5
A boatman rows at 10 km/h in still water and the stream flows at 4 km/h. How long will he take to go 21 km downstream and return to the start (in hours)?
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