SOLUTION: Mary can paint her apartment in 5 hours. Jim can paint it in 7 hours. If they work together, how long will it take to paint Mary's apartment?

Question 547344: Mary can paint her apartment in 5 hours. Jim can paint it in 7 hours. If they work together, how long will it take to paint Mary's apartment?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
add their rates of painting
Mary's rate:
( 1 apt ) / ( 5 hrs )
Jim's rate:
{ 1 apt. ) / ( 7 hrs )
Working together:
( 1 apt. ) / ( x hrs )
----------------

Multiply both sides by

This is 2 and 11/12

It will take them 2 hrs and 55 min working together
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