- A3 hours
- B2.5 hours
- C2.14 hours
- D3.33 hours
Step-by-Step Solution
Downstream = 14 km/h; upstream km/h. Time = 30 ÷ 10 = 3 hours.
Answer: A) 3 hours
A motor launch makes the 21 km run from A to B downstream in 1.5 hours. The river flows at 2 km/h. How long does the launch take for 30 km upstream?
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