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17 October, 04:39

Sally paints a room in 6 hours while it takes Steve 9 hours to paint the same room. how long would it take them to paint the room if they worked together

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  1. 17 October, 05:01
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    If Sally paints one room per six hours, she paints 1/6 of the room every hour. Similarly, Steve paints 1/9 of the room every hour. Therefore, together, they paint 1/6+1/9=5/18 of the room every hour. Therefore, it takes the 18/5 of an hour to paint the whole room, since 18/5*5/18=1, so 18/5 of an hour at 5/18 of the room per hour is one room.
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