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13 April, 10:01

Bob can shave a cat in 3 hours; Fred can do it in 4 hours. If they work together without wasting a ton of time like they always do, how long will it take to shave the cat?

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  1. 13 April, 10:40
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    The answer to your question is 1 5/7 or 1.7 hours ≈ 1:43 min

    Step-by-step explanation:

    Data

    Bob lasts 3 hours

    Fred lasts 4 hours

    Together = ?

    Process

    1. - Determine what they do in 1 hour

    Bob = 1/3 in x hours x/3

    Fred = 1/4 in x hours x/4

    2. - Write the equation to this problem

    x/3 + x/4 = 1

    3. - Solve it for x

    (4x + 3x) / 12 = 1

    7x = 12

    x = 12/7

    x = 1 5/7 or 1.7 hours ≈ 1:43 min
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