Mathematics · Speed, Time and Distance
To go 144 km upstream, a rower takes 12 hours, while it takes her only 9 hours to row the same distance downstream. What was the speed (in km/h) of the stream?
- 13 km/h
- 21.5 km/h
- 31 km/h
- 42 km/h✓
Correct answer
2 km/h
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