Question 245348
Hello, 
We're dealing with a right triangle so we can apply the following formula:
A^2 + B^2 = C^2 (C will be the leg back) Now we can plug in the numbers. 
8^2 + 15^2 = C^2 Do the calculations will result in:
64 + 225 = c^2  Combine like terms:
289 = c^2  Square root each side will give us:
c = 17
There we go. the answer is:
17 Miles
Let me know if this makes sense to you. 
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RJ Toftness