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Yalmaz can cover a distance of 400 metres in 2 minutes. Rayan can cover 1 km in 300 seconds. Find the ratio of their speeds.

Correct answer: D. 1:1

  • A. 2:5
  • B. 4:3
  • C. 1:2
  • D. 1:1

Explanation

Yalmaz's speed is 400 m ÷ 120 s = 10/3 m/s. Rayan's speed is 1000 m ÷ 300 s = 10/3 m/s, so their speed ratio is 1:1. The likely choice is c, 1:2, from comparing the distances without converting their different times consistently.

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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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