As per the problem,
The larger pump takes 40 minutes to fill the pool.
The smaller one takes 60 minutes.
When both the pumps are working , let the time taken be x minutes , then we can write

Hence, when both the pumps works together, Time taken =24 minutes.
Answer:
C≈62.83
Step-by-step explanation:
Use the formula C=πd
Plug in 20 for d and simplify
You then get 62.8318530718 in a calculator
So, you round it to 62.83
Factors of 75 and 100
75=1,3,5,15,25
100=1,2,4,5,10,20,25
25 is your greatest common factor
X=10
-3 on both sides
Then -6(x+4)+3 to the other side
the rate of growth will be 1.16