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Whe she was in year 8, sarah could run 800 metres in 3 minutes and 20 seconds. Three years later, when she was in year 11, she could run 800 metres in 2 minutes and 44 seconds. Find the percentage improvement in her time.

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Rentib
Info u have

8yr : 3min 20s=60s * 3 + 20s = 180s + 20s = 200s
11yr : 2min 44s = 60s * 2 + 44s = 120s + 44s = 164s

Counting:

200s - 164s = 36s

36s 18
——- = ——- = 18%
200s. 100

Check:

200s * (100% - 18%) = 164s

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