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27 February, 23:15

Together, Bob and Tom take 4 hours to get the yard work done. If Bob works alone, it takes him 6 hours. How long would it take Tom, working alone, to do all of the yard work?

10 hours

12 hours

8 hours

9 hours

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Answers (1)
  1. 27 February, 23:36
    0
    The answer is 12 and let me tell you how can you get to that conclussion:

    Let X be the number of hrs Tom takes to do it

    Add their rates of working

    (1 yard) / (6 hrs) + (1 yard) / (X hrs) = (1 yard) / (4 hrs) and then what you do is

    1/6 + 1/x = 1/4

    Remember to multiply both sides by 12x

    then = 2x + 12 = 3x
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