Multiple choice

A boy walks 15 m in 7 seconds and then walks back in 5 seconds. His average speed (in m/s) is:

  1. 6

  2. 2.5

  3. 3.25

  4. 4
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Average speed is total distance divided by total time. The boy walks 15 m there and 15 m back, totaling 30 m. The total time is 7 seconds plus 5 seconds, which is 12 seconds, so 30/12 = 2.5 m/s.

AI explanation

The total distance traveled is 15 meters out plus 15 meters back, totaling 30 meters. The total time taken is 7 seconds plus 5 seconds, totaling 12 seconds. Average speed equals total distance divided by total time, so 30 divided by 12 is 2.5.

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