Posted by kejuan on Tuesday, September 25, 2007 at 9:02pm.
Lenny,mark,andliza are going to jog along 3 different trails in the park. To complete one circuit , lenny takes 6 min., Mark takes 12 min., and liza takes 9 min. if they start at the same place and the same time, how long will it be before they are together again at the starting point?

MATH  bobpursley, Tuesday, September 25, 2007 at 9:07pm
Wouldn't have to be a common factor? something 6,12, and 9 all go into?

MATH  Mathilde, Tuesday, September 25, 2007 at 9:10pm
Yes, they do. =)

MATH  drwls, Tuesday, September 25, 2007 at 9:08pm
Look for the least common multiple of 3, 9 and 12. It will have to be the product of at least two 3's and two 2's.
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