Problema Solution
Working together, it takes two computers 5 minutes to send out a company’s email. If it takes the slower computer 15 minutes to do the job on its own, how long will it take the faster computer to do the job on its own?
Answer provided by our tutors
the rate of the slower computer is 1/15 mails per minute sent
lets say that the faster computer needs x min to send the mail thus his rate is 1/x mails per minute
working together they have a together rate 1/5 mails per minute
1/15 + 1/x = 1/5
by solving we find
x = 7.5 min
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