- A2 hours
- B2.4 hours
- C1.8 hours
- D3 hours
Step-by-Step Solution
Upstream = 12 km/h; still water = 15; downstream = 18 km/h. Time back = 36 ÷ 18 = 2 hours.
Answer: A) 2 hours
A boat takes 3 hours to go 36 km upstream. If the river flows at 3 km/h, how long will the boat take to come back downstream?
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