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16 June, 05:03

When she was in year 8, Sarah could run 800 meters in 3 minutes and 20 seconds.

Three years later, when she was in year 11, she could run 800 meters in 2 minutes and 40 seconds.

Find the percentage improvement in her time and show your working out.

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  1. 16 June, 08:15
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    125% improvement

    Step-by-step explanation:

    3min 20sec = 200sec

    2min 40sec = 160sec

    800meters / 200sec = 4 meters per second

    800meters / 160sec = 5 meters per second

    5/4 : x/100

    4x = 500

    x = 125
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