請用公因數or公倍數解答！please
Peter and Paul are running on a circular track. Peter completes one cycle in 7
minutes and paul completes one cycle in 9 minutes. Suppose they start running at
the same starting point now. How long will they take to meet again at the starting
point if
( a ) they run in the same direction.
( b ) they run in opposite directions.
F.1 math 唔識!!!!!!!!!!!!
2012-07-27 12:30 am
回答 (2)
2012-07-27 12:49 am
✔ 最佳答案
(a)L.C.M. of 7 and 9
= 7 x 9
= 63
If they run in the same direction, time taken for them to meet again at thestarting point
= 63minutes
(b)
L.C.M. of 7 and 9
= 7 x 9
= 63
If they run in opposite directions, time taken for them to meet again at thestarting point
= 63minutes
參考: 賣女孩的火柴
2012-07-27 4:33 pm
a.
7 minutes because Peter and Paul ride at the same direction
although the lengh of they ride 1 minute is not same but they can meet when they also ride 7 times.
b.
63minutes because the L.C.M. of 7 and 9 is 63.
7 minutes because Peter and Paul ride at the same direction
although the lengh of they ride 1 minute is not same but they can meet when they also ride 7 times.
b.
63minutes because the L.C.M. of 7 and 9 is 63.
參考: my maths
收錄日期: 2021-04-13 18:51:21
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https://hk.answers.yahoo.com/question/index?qid=20120726000051KK00451