- A3 hours
- B3.6 hours
- C2.5 hours
- D4 hours
Step-by-Step Solution
Upstream = 90 ÷ 4.5 = 20 km/h, so stream = 5 km/h. Downstream = 30 km/h. Return time = 90 ÷ 30 = 3 hours.
Answer: A) 3 hours
A steamer's still-water speed is 25 km/h. It goes 90 km upstream in 4.5 hours. How long will it take to return downstream?
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