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A person crosses a 600 m long street in 5 minutes. What is his speed in km per hour?

Correct answer: D. 7.2

  • A. 8.2
  • B. 4.2
  • C. 6.1
  • D. 7.2

Explanation

The person covers 600 m in 5 minutes = 300 seconds, so speed = 600 m / 300 s = 2 m/s. Since 1 m/s = 3.6 km/h, the speed is 2 x 3.6 = 7.2 km/h. The likely wrong choice is 6.1 km/h, caused by an incorrect unit conversion.

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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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