- A4 : 1
- B5 : 1
- C3 : 2
- D2 : 1
Step-by-Step Solution
Speeds are in the inverse ratio of times: downstream : upstream = 9 : 6 = 3 : 2. So (in units), giving .
Answer: B) 5 : 1
Over one stretch of river a boat needs 9 hours upstream but only 6 hours downstream. What is the ratio of the boat's speed in still water to the speed of the current?
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