- A5 : 9
- B9 : 5
- C7 : 9
- D5 : 7
Step-by-Step Solution
Take boat = 7k, stream = 2k. Upstream = 5k, downstream = 9k, so the ratio is 5 : 9.
Answer: A) 5 : 9
The ratio of a boat's still-water speed to the stream's speed is 7 : 2. What is the ratio of its upstream speed to its downstream speed?
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