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#### calbeach900

##### New member

- Jan 7, 2021

- 1

Pipe A takes 20 hours longer to fill swimming pool than pipe B. Together, pipe A and pipe B can fill the swimming pool in 30 hours.

The assignment question I am stuck on is to

**. After I have come up with the R(x) function, I will need to graph that function for my assignment.**

__write a function R(x) that models the combined rate of the two pipes in relation to the time it takes for pipe B to do it by itself__I already know how to solve for the individual times for each pipe where:

1/job 1 + 1/job 2 = 1/total

time to fill with Pipe B = x

time to fill Pipe A = x+20

1/x + 1/(x+20) = 1/30

Solving for x will give me the rates of the individual pipes.

The assignment question I am stuck on is I can't figure out how to write the function R(x) that models the combined rate of the two pipes in relation to the time it takes for pipe B to do it by itself.