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26 June, 02:02

A runner runs 300 m at an average speed of 3.0 m/s. She then runs another 300m at an average

speed of 6.0 m/s.

What is her average speed for the total distance of 600m?

A 2.0 m/s

B 4.0 m/s

C 4.5 m/s

D 8.0 m/s

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Answers (1)
  1. 26 June, 03:13
    0
    B. 4 m/s

    Explanation:

    v=d/t

    Running for 300 m at 3 m/s takes 100 seconds and running at 300 m at 6 m/s takes 50 seconds. 100 s + 50 s = 150 s (total time). Total distance is 600 m, so 600 m / 150 s = 4 m/s.
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