Thursday
September 18, 2014

Homework Help: Math

Posted by Jane on Wednesday, December 5, 2012 at 11:26am.

Jess is running around a circular track, one lap every 40 seconds. Mackenzie is also running at a constant speed around the same track, but in the opposite direction. They meet every 15 seconds. How many seconds does it take Mackenzie to do one lap?

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