- A18 km/h
- B15 km/h
- C12 km/h
- D21 km/h
Step-by-Step Solution
The stream takes away 20% of the boat's speed: , so . Downstream = 18 km/h.
Answer: A) 18 km/h
A boat's upstream speed is 80% of its still-water speed. If the stream flows at 3 km/h, what is its downstream speed?
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