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The speed at which a man can row a boat in still water is 15 kmph. If he rows downstream, where the speed of current is 3 kmph, what time will he take to cover 60 metres?

Correct answer: D. 12 seconds

  • A. 10 seconds
  • B. 15 seconds
  • C. 20 seconds
  • D. 12 seconds
  • E. None of these

Explanation

The downstream speed is 15 km/hr + 3 km/hr = 18 km/hr. Converting this gives 18 km/hr = 5 m/sec, so the time for 60 metres is 60 m ÷ 5 m/sec = 12 seconds. The likely mistake is option c, 20 seconds, which uses the still-water speed or an incorrect conversion between kilometres per hour and metres per second.

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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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