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The rate of work of two computers working together is of the job per minute.
The rate of work of the slower computer is of the job per minute.
Hence, the rate of work of the faster computer is the difference - = = of the job per minute.
It means that the faster computer can complete the job in minutes = 7 minutes and 12 seconds working alone. ANSWER
Solved.
When solving problems like this one, you should know and should remember two basic facts:
- the rate of work of two workers/machines/tubes is the sum of the rates of individuals;
- If you are given the combined rate of work of two workers/machines/tubes and the rate of work of one individual,
then the rate of work of the other individual is the difference of rates.
Completely self-evident facts.
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It is a standard and typical joint work problem.
There is a wide variety of similar solved joint-work problems with detailed explanations in this site. See the lessons
- Using Fractions to solve word problems on joint work
- Solving more complicated word problems on joint work
- Selected joint-work word problems from the archive
Read them and get be trained in solving joint-work problems.
Also, you have this free of charge online textbook in ALGEBRA-I in this site
- ALGEBRA-I - YOUR ONLINE TEXTBOOK.
The referred lessons are the part of this textbook under the topic
"Rate of work and joint work problems" of the section "Word problems".
Save the link to this online textbook together with its description
Free of charge online textbook in ALGEBRA-I
https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson
to your archive and use it when it is needed.