- A4 hours
- B3.5 hours
- C5 hours
- D4.5 hours
Step-by-Step Solution
Downstream speed = 66 ÷ 3 = 22 km/h, so the stream = 22 − 18 = 4 km/h. Upstream = 18 − 4 = 14 km/h. Time = 56 ÷ 14 = 4 hours.
Answer: A) 4 hours
A launch goes 66 km downstream in 3 hours. If its speed in still water is 18 km/h, how long will it take to cover 56 km upstream?
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