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24 February, 12:27

Working? alone, a person a can paint a room in 4 hr. person b can paint the same room working alone in 6 hr. how long will it take them if they work? together?

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  1. 24 February, 15:02
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    We will express the work done relative to time thus,

    person a = 1/4

    person b = 1/6

    Since two of them will work together and then add the two.

    total work = person a + person b

    = 1/4+1/6

    = (3+2) / 12

    =5/12 hours

    in hours

    1/t=5/12 hours

    total time = 2.4 hours or 2 hours and 24 mins.

    The total time that person a and person b when working together will make the work done in 2.4 hours.
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