Multiple choice

What should be the average speed of a car (in metres/second) to cover a distance of 252 km in 2.5 hours?

  1. 100.8 m/s

  2. 50.4 m/s

  3. 28 m/s

  4. 56 m/s
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C Correct answer
Explanation

Average speed = Total distance / Total time = 252 km / 2.5 hours = 100.8 km/h. To convert to m/s, multiply by 5/18: 100.8 * 5 / 18 = 28 m/s.

AI explanation

Using the formula for average speed which is distance divided by time, the speed is 252 km divided by 2.5 hours which equals 100.8 km/hr. To convert this to metres per second, multiply by 5 divided by 18. The result is 100.8 multiplied by 5 and then divided by 18, which equals 28 m/s.

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