- A3 h 12 min
- B3 h
- C3 h 30 min
- D2 h 48 min
Step-by-Step Solution
Stream = 6 ÷ 2 = 3 km/h. Down: 18 ÷ 15 = 1.2 h; up: 18 ÷ 9 = 2 h. Total = 3.2 h = 3 h 12 min. (3 h ignores the current.)
Answer: A) 3 h 12 min
A boat's upstream speed is 6 km/h less than its downstream speed, and its speed in still water is 12 km/h. How long will 18 km downstream plus 18 km back upstream take?
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