Hi! Can someone please help me? Julie an experienced bricklayer can build a wall in 55 hours, while her daughter can do the job in 66

Question

Hi! Can someone please help me?
Julie an experienced bricklayer can build a wall in 55 hours, while her daughter can do the job in 66 hours. How long will it take for them to build the wall together?

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Khoii Minh 5 months 2021-09-05T15:15:12+00:00 1 Answers 3 views 0

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  1. taiduc
    0
    2021-09-05T15:16:25+00:00
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    Answer:

    30 hrs

    Step-by-step explanation:

    In 1 hour, J completes 1/55 of job

    In that time, D completes 1/66 of job

    J + D together complete 1/55 + 1/66 of the job in 1 hour

    1/55 + 1/66 = 1/30

    Together, it takes them 30 hours to build the wall.

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