SOLUTION: chris can mow the lawn in 2 hours and 23 minutes. Jim can mow the lawn in 3 hours and 15 minutes. If they work together, how long will it take them to mow the lawn. I tried to a

Question 577635: chris can mow the lawn in 2 hours and 23 minutes. Jim can mow the lawn in 3 hours and 15 minutes. If they work together, how long will it take them to mow the lawn. I tried to average the times but I got the answer wrong.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Add their rates of mowing to get thir
rate working together
Chris's rate: ( 1 lawn ) / ( 2 hrs, 23 min )
Jim's rate: ( 1 lawn ) / ( 3 hrs 15 min )
Let = time in minutes for them
to mow lawn together
------------------

Multiply both sides by

Working together, it takes them 1 hr and 22.5 min
check:

OK
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