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anonymous
 5 years ago
You can paint a certain room in 7 hours. Your brother can do it in 6 hours. How long does it take the two of you working together?
anonymous
 5 years ago
You can paint a certain room in 7 hours. Your brother can do it in 6 hours. How long does it take the two of you working together?

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amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0the answer lies in knowing how long it takes for each of you to paint the room in one hour. you can paint 1 room in 7 hours; so in one hour 1/7 of the room is painted by you. bro can paint the room in 6 hours, so 1/6 of the room is painted by him in one hour. how much of the room can you and your bro paint in one hour: 1/7 + 1/6 = 13/42. So in one hour you get 13/42 painted together; 2 hours is 26/42 painted 3 hours is 39/42 painted. So we are up to 3 hours. Whats left? 3/42 = 1/14. What is 1/14th of an hour? That is 60/14 = 30/7 = 4 2/7 I would estimate 3 hours and 4 1/2 minutes...
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