Question 262898
    If Sally can paint a house in 4 hours, and John can paint the same house in 6 hour, how long will it take for both of them to paint the house together?
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Let x = hours it takes for both
then
x(1/4 + 1/6) = 1
.
Multiplying both sides by 24 we get:
x(6 + 4) = 24
x(10) = 24
x = 2.4 hours
.
or
2 hours and 24 minutes