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A man can row upstream at 25 kmph and downstream at 35 kmph, and then find the speed of the man in still water?

Correct answer: C. 30 kmph

  • A. 60 kmph
  • B. 10 kmph
  • C. 30 kmph
  • D. 5 kmph

Explanation

The still-water speed is the average of the downstream and upstream speeds because the current is added in one direction and subtracted in the other. Thus, still-water speed = (35 km/h + 25 km/h) ÷ 2 = 30 km/h. The likely mistake is selecting 10 kmph, which is twice the current speed, not the rowing speed in still water.

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About Time, Speed and Distance

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