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21 August, 10:06

Brett can plow out all the driveways on his street with his new four-wheel-drive truck in 6 hours. Using a snow blade on a lawn tractor, his neighbor can plow out the same number of driveways in 12 hours. How long would it take them to do the work together?

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  1. 21 August, 10:37
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    4 hours

    Step-by-step explanation:

    The truck works twice as fast as a lawn tractor, so is equivalent to 2 of them. Together, they are equivalent to 3 lawn tractors, so can do the job in 1/3 the time of one of them: 4 hours.
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