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April 1, 2015

Posted by **iris** on Wednesday, October 26, 2011 at 11:38am.

- math -
**bobpursley**, Wednesday, October 26, 2011 at 11:44amjohn rate= job/7hrs

mary rate=job/5 hrs

combined rate= job/7hrs+job/5hrs= (5+7)/35= 10/35 job/hr

so, time= howmuch/rate= 1job/(10jobs/35hrs)= 3.5 hrs

- math -
**Steve**, Wednesday, October 26, 2011 at 5:02pmOr, if you use base 10, where 7+5=12, that would be 35/12 hours, or 2 hours 55 min

The 3.5 hours caught my eye, because that would be the time taken by 2 people who take 7 hours each.

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