- AFerry C
- BFerry A
- CFerry B
- DFerry D
Step-by-Step Solution
Current = (down − up) ÷ 2. A: (15 − 10)/2 = 2.5; B: (16 − 12)/2 = 2; C: (18 − 12)/2 = 3; D: (20 − 16)/2 = 2 km/h. Ferry C's river is fastest.
Answer: A) Ferry C
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