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Two pumps, working together, drain of the tank volume per hour.
The older tank drains of the tank volume per hour.
Hence, the newer pump drains - = = = of the tank volume per hour.
Hence, it will take 4 hours for the newer pump to drain the tank working alone.
Solved.
> > > Be aware: The answer and the solution by the other tutor both are I N C O R R E C T ! < < <
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It is a typical and standard 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.