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24 September, 12:04

One student can paint a wall in 15 minutes. Another student can paint the same wall in 20 minutes. Working together, about how long will it take for them to paint the wall?

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  1. 24 September, 16:03
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    Hi,

    From the rule

    (1/x) + (1/y) = (1/z)

    1/15+1/20=1/z

    7/60=1/z

    z=60/7
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