SOLUTION: If Mary can paint a house in 4 hours and Dan can paint a house in 6 hours how long will it take them to paint a house together?

Question 905076: If Mary can paint a house in 4 hours and Dan can paint a house in 6 hours how long will it take them to paint a house together?
Found 2 solutions by ewatrrr, josmiceli:
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
x the time together

3x + 2x = 12
5x = 12
x = 2.4hr, the time together
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Add their rates of painting
Mary's rate:
( 1 house ) / ( 4 hrs )
Dan's rate:
( 1 house ) / ( 6 hrs )
---------------------
Let = time in hrs to paint
the house working together

Multiply both sides by

It will take them 1 hr 24 min working together

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