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15 July, 13:32

one student can paint a wall in 10 minutes. another student can paint the same wall in 15 min. working together, how long will it take for them to paint the wall

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  1. 15 July, 13:46
    0
    6 minutes

    Step-by-step explanation:

    Formula

    1/15 + 1/10 = 1 / x where x is the time it takes both of them to do the job.

    Solution

    The lowest common denominator for 1/15 and 1/10 is 30

    2/30 + 3/30 = 1/x

    5/30 = 1/x Cross multiply

    5x = 30 Divide by 5

    5x / 5 = 30/5

    x = 6
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