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數學問題[english]

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In a ferry pier , ferries set off for islands a,b and c every 25,45 and 75 minutes respectively.At 10:00a.m. , ferries set off from the pier for all the three islands.When will they set off again if the ferry services end at 11:00p.m. every?List all the possible cases.And how to calculate?

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Find L.C.M. of 25,45 and 75 we get 225, that means all ferries will set off altogether again after every 225 minutes before 11:00pm (23:00). So, the ferries will set off altogether in the following time: 1) 13:45 (1:45 pm) 2) 17:30 (5:30pm) 3) 21:15 (9:15pm)

其他解答:FAD2A23AB937987B
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