In a ferry pier,ferries set off for Island A , B and C every 25 , 45 and 75 minutes respestively . At 10:00 a.m. , ferries set off from the pier for all three islands . When will they set off again if the ferry services end at 11:00 p.m. every day ? List all the possible cases .
I want the answer today !!!!!
THX
F.1 Mathematics
2008-07-20 7:33 pm
回答 (1)
2008-07-20 8:42 pm
✔ 最佳答案
LCM of 25,45&75 = 225So they will sent off together for every 225 minutes period.
At 10:00am, after 225 minutes ( 3 hours and 45 minutes) , the time should be 1:45pm.
After a 225 minutes time period again, the time is 5:30pm.
So the possible cases are 1:45pm, 5:30pm, 9:15pm
參考: me
收錄日期: 2021-04-15 17:33:56
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080720000051KK00775