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A man can row a boat at 20 kmph in still water. If the speed of the stream is 6 kmph, what is the time taken to row a distance of 60 km downstream?

Correct answer: D. 30/13 hours

  • A. 20/6 hours
  • B. 27/2 hours
  • C. 30 hours
  • D. 30/13 hours

Explanation

The downstream speed is 20 km/hr + 6 km/hr = 26 km/hr. Therefore, time = 60 km ÷ 26 km/hr = 30/13 hours, approximately 2.31 hours. The likely mistake is option a, 20/6 hours, which divides the distance by the stream speed instead of the full downstream speed.

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About Time, Speed and Distance

Problems relate distance, speed and time through the formula distance = speed × time, including unit conversion, average speed, relative speed and motion in opposite or the same direction. Questions may involve trains, boats and streams, where the effective speed changes, so average speed must not be confused with the simple average of two speeds.

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