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14 August, 22:24

Ben and Sadie are doing a sponsored walk around a circuit.

Ben takes 25 minutes to do one circuit and Sadie takes 45 minutes.

They start together at 9:30 am.

When will they next cross the start line together?

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  1. 15 August, 02:08
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    25=52 and 45 = 5•32

    The least common multiple has to be 52•32 = 9 times 25 = 225 minutes, which is 3 hours + 45 minutes.
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