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A person can swim in still water at 4 km/h. If the speed of water 2 km/h, how many hours will the man take to swim back against the current for 6km?

Correct answer: A. 3

  • A. 3
  • B. 4
  • C. 4 (1/2)
  • D. Insufficient data

Explanation

Against the current, the effective speed is 4 km/h - 2 km/h = 2 km/h. The time required for 6 km is 6 km ÷ 2 km/h = 3 h. A likely mistake is using the still-water speed and choosing 1.5 h or another shorter time, ignoring that the current opposes the swimmer.

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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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