Saleeha Saleeha

19-02-2020
Mathematics

contestada

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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2happy2feet 2happy2feet

19-02-2020

Answer:

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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