Question

5 STARS!!!

Boris and Dylan can each run a distance of 5 miles. Boris takes x minutes to run 5 miles.

What does the denominator of the rational expression 5/x+12 mean in the context of this situation?

Answer 1

the denominator represents the time Dylan takes to run 5 miles if he takes 12 minutes more than Boris

Explanation:

I took the test :)

Answer 2

Since it is given that Boris takes x minutes to run 5 miles it means that Boris' speed will be given as:
`(5)/(x)`.

Now, if Dylan runs slower than Boris and takes 12 more minutes to complete the 5 miles run, then that would mean that Dylan takes (x+12) minutes to complete the same run.

In this case we can see the Dylan's speed will be
`(5)/(x+12)`.

Thus, the denominator represents the time Dylan takes to run 5 miles if he takes 12 minutes more than Boris.

Therefore, out of the given options, the second option is the correct option.