- A3 h 35 min
- B3 h 20 min
- C4 h 15 min
- D4 h 35 min
Step-by-Step Solution
All of it is downstream at 18 km/h: 60 ÷ 18 = 3 h 20 min. Add the 15-minute halt: 3 h 35 min.
Answer: A) 3 h 35 min
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