- A12 km/h
- B6 km/h
- C13.5 km/h
- D10.5 km/h
Step-by-Step Solution
Times 2 : 1 ⇒ speeds D : U = 2 : 1. 9 + s = 2(9 − s) ⇒ s = 3. Downstream = 9 + 3 = 12 km/h.
Answer: A) 12 km/h
Over any fixed stretch, a rower takes double the time going against the current that he takes going with it. His still-water speed is 9 km/h. What is his downstream speed?
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