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12 June, 21:11

Sally can paint a room in 4 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. 13 June, 01:08
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    Sally ⇒

    4 hours = 1 room

    1 hour = 1/4 of the room

    Steve ⇒

    9 hours = 1 room

    1 hour = 1/9 of the room

    Sally + Steve ⇒

    1 hour = 1/4 + 1/9 = 9/36 + 4/36 = 13/36

    Number of hours needed ⇒

    1 : 13/36 = 1 x 36/13 = 36/13 = 2 10/13 hours

    Answer: They need 2 10/13 hours.
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