SOLUTION: It takes an older computer 4 times as long to send out a company’s email as it does a newer computer. Working together, it takes the two computers 12 minutes to send out the email

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Question 871188: It takes an older computer 4 times as long to send out a company’s email as it does a newer computer. Working together, it takes the two computers 12 minutes to send out the email. How long will it take the older computer to send out the email on its own?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
1/x+1/(4x)=1/12
4/4x+1/4x-1/12
5/4x=1/12
60=4x old
15=x new
checks
1/15+1/60=1/12
4/60+1/60=1/12
5/60=1/12
ok
12/60+12/15=1
1/5+4/5=1
ok