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 10 minutes to send out the email. How long will it take the newer computer to send out the email on its own?
Suppose the old computer can send out
Working together they could send out
and in 10 minutes they could send out
Since the new computer can send out
in order to send out
the new computer would require