Working together, it takes two computers 15 minutes to send out a company's email. If it takes the slower computer 60 minutes to do the job on its own, how long will it take the faster computer to do the job on its own? Do not do any rounding.

Question

Emely West

Mathematics

14 December, 07:46

Working together, it takes two computers 15 minutes to send out a company's email. If it takes the slower computer 60 minutes to do the job on its own, how long will it take the faster computer to do the job on its own? Do not do any rounding.

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Answers (1)

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Diamond Whitaker · Answer 1

Let x = time (minutes) it takes for the faster computer to do the job alone

then

12 (1/30 + 1/x) = 1

multiplying both sides by 30x:

12 (x + 30) = 30x

12x + 360 = 30x

360 = 18x

20 minutes = x