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30 March, 22:12

Toya can run one lap of the track on 1 minute 3 seconds, which is 90% of her younger sister niki's time. What is niki's time for one lap of the track?

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  1. 30 March, 23:34
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    63 seconds is 90% of Niki's time for one lap. So, Niki's time for one lap is 63/0.9, which equals 70 seconds or 1 min. 10 seconds.
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