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A car covers 240 kilometres in 3 hours. What is its average speed?

Correct answer: C. 80 km/h

  • A. 60 km/h
  • B. 70 km/h
  • C. 80 km/h
  • D. 90 km/h

Explanation

Speed = distance ÷ time = 240 ÷ 3 = 80 km/h. Note that this is average speed; the car’s instantaneous speed may have varied throughout the journey.

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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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