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25 April, 02:17

It takes Sally 4 hours to deliver newspapers. If Kathy works alone, it takes her 6 hours. How long would it take them working together to deliver all of the newspapers?

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  1. 25 April, 04:43
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    Sally's rate is 1/4 job per hour.

    Kathy's rate is 1/6 job per hour.

    Can you solve the rest? Scroll down if you can't!

    1/4 + 1/6

    = 3/12 + 2/12

    = 5/12

    5/12 x 6 = 30/60.

    Answer: It will take them half an hour combined.
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