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19 September, 02:41

David can unload a delivery truck in 20 min. Allie can unload the same delivery truck in 35 min. if they work together, how long will the unloading take?

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  1. 19 September, 05:37
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    Answer: 12.7 minutes

    Step-by-step explanation:

    1/20 + 1/35 = 1

    35t + 20t/20 x35 = 1

    55t/700=1

    55t=700

    700/55=12.7
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