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In a river, a man takes 3 hours in rowing 3 km upstream or 15 km downstream. What is the speed of the current?

Correct answer: A. 2km/hr

  • A. 2km/hr
  • B. 4km/hr
  • C. 6km/hr
  • D. 9km/hr

Explanation

The upstream speed is 3 km ÷ 3 hr = 1 km/hr, and the downstream speed is 15 km ÷ 3 hr = 5 km/hr. The current speed is half their difference, (5 - 1) ÷ 2 = 2 km/hr. A likely wrong choice is 4 km/hr, which is the difference between the upstream and downstream speeds, not half of it.

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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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