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22 December, 22:48

Working together, Melissa and Jing can mow a lawn in 5 hours. It would take Melissa 8 hours to do the job alone. What is the value of r, the part of the lawn that Jing could complete in 1 hour? A. 0.075.

B. 0.125.

C. 0.375.

D. 0.625.

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Answers (2)
  1. 22 December, 22:56
    0
    Answer: option A
  2. 22 December, 23:11
    0
    The amount of work completed by Jing in 1 hour is 0.075 which is option A

    Step-by-step explanation:

    Melissa & Jing can complete the work in 5 hours

    This means that the amount of work completed by Melissa & Jing working together in 1 hour is (1:5) = 0.2

    Melissa will do the job in 8 hours, which means that the amount of job completed by Melissa working alone in 1 hour is (1:8) = 0.125

    The amount of work completed by Jing when he works alone in 1 hour will be the difference of amount of work completed by both of them in 1 hour with the amount completed by only Melissa in 1 hour.

    There Amount of work completed by Jing in an hour = 0.2 - 0.125 = 0.075
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