Question 1119
First you have to know how much painting they could done in one hour
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For one hour, she can paint 1/4 of the house because 1 divide by 4 is 1/4
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For Joe, he can paint 1/6 of the house in one hour because 1 divide by 6 is 1/6
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So now we can add 1/4 and 1/6 together to determine how much they could paint in one hour which is equal to 3/12 + 2/12 = (5/12)
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So they could finish 5/12 of painting in one hour, now we can devide 1 by (5/12) to determine how much time they need to paint the whole house
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1/(5/12) = 2.4
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So they took 2.4 hour (or 2 hours 24 mins) to paint a house together