Acompany has two large computers. the slower computer can send all the company's email in 55 minutes. the faster computer can complete the same job in 45 minutes. if both computers are working together, how long will it take them to do the job?

The slower computer does 1/55 of the e-mails per minute. The faster computer does 1/45 of the e-mails per minute. Then
1/45+1/55=45+55/2475=100/2475 together
2475/100=24.75 minutes for the two of them working together
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38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)