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21 April, 05:49

Machine A working alone can complete a job in 3 1/2 hours. Machine B working alone can do the same job in 4 2/3 hours. How long will it take both machines working together at their respective constant rates to complete the job? A. 1 hr 10 minB. 2hrC. 4hr 5 minD. 7hrE. 8 hr 10 min

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  1. 21 April, 07:53
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    B) 2 hours

    Step-by-step explanation:

    If machine A complete a job in 3 1/2 hours or 7/2 of an hour

    means that in one hour finished 1: 7/2 or 2/7

    If machine B complete a job in 4 2/3 hours or 14/3 of an hour

    means that in one hour finished 1: 14/3 or 3/14 of an hour

    Then the two machines working together in one hour will make

    2/7 + 3/14 = (4 + 3) / 14

    or 7/14 = 1/2

    half of the job. Therefore these two machines working together will take two hours
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