Answer:

Step-by-step explanation:
The figure attached show a general description of the problem.
For this case the best way to solve the problem is use the general equation for an hyperbola given by:

We assume that the longer axis for the hyperbola is on the y axis.
On this case the total distance traveled by the sound is 1100 and we can find the value of a like this:


Since both people are apart 6 miles we can find the value of c like this:

c= 6 miles and we can convert this into ft like this:

And we can find the value of b like this:

And then our equation is given by:

And for this case we want to find the value of x when y = 6ft=31680 ft[/tex], and solving for x we got:


