- A7 h 12 min
- B7 h 30 min
- C6 h 45 min
- D7 hours
Step-by-Step Solution
and ⇒ , AB = 36 km, still water = 10 km/h. 72 ÷ 10 = 7.2 h = 7 h 12 min. (7 h 30 min is just 3 + 4.5.)
Answer: A) 7 h 12 min
A motorboat goes downstream from A to B in 3 hours and back in 4.5 hours. The current is 2 km/h. How long would the whole out-and-back trip take on still water?
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