A man rows 20 km upstream and back again to the starting point in 110 minutes. If the speed of the stream is 2 kmph, then the speed of rowing in still water is
Question and options
A man rows 20 km upstream and back again to the starting point in 110 minutes. If the speed of the stream is 2 kmph, then the speed of rowing in still water is
- 20 kmph
- 22 kmph
- 24 kmph
- 28 kmph
Answer and explanation
Correct answer: B - 22 kmph
20/(v-2) + 20/(v+2) = 110/60 h. v = 22 gives 1 + 5/6 = 11/6 h, so it fits.
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