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Workers with different hours per day: days in man-hours

This type of question, asked 2 times: 14 Jul 2023 S3, 17 Jul 2023 S2. All 2 questions below, oldest first.

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  1. Question 1

    14 Jul 2023 S3

    59
    A's efficiency is twice that of B's. A can work only for 8 hours a day while B can work for 12 hours a day. If A can finish a work in 12 days, in how many days can B finish the same work?

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  2. Question 2

    17 Jul 2023 S2

    70
    Working 5 hours a day, A can complete a task in 8 days and working 6 hours a day, B can finish the same task in 10 days. working 8 hours a day, they can jointly complete the task in ______.

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