SOLUTION: It takes an older computer four times as long to send out a companies email as it does a new computer. Working together it takes the two computers 15 minutes to send out the email.

Question 1146316: It takes an older computer four times as long to send out a companies email as it does a new computer. Working together it takes the two computers 15 minutes to send out the email. How long will it take the newer computer to send out the email on its own?
There is no rounding needed
Answer by greenestamps(13216) (Show Source): You can put this solution on YOUR website!

Since the new computer works 4 times as fast as the old, when the two work together the new computer does 4/5 of the job.

So in the 15 minutes it takes to do the job, the new computer does 4/5 of the work; that means to do the job alone the number of minutes the new computer would need is 15*(5/4) = 75/4.

ANSWER: 75/4 minutes, or 18 3/4 minutes, or 18 minutes 45 seconds.
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