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20 January, 09:08

Ave can assemble a computer by himself in 40 minutes. manny does the same job in 55 minutes. how long will it take them to assemble a computer working together?

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  1. 20 January, 09:11
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    The time needed = 1 / (1/40+1/55)

    = 440/19 = 23.15 minutes
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