The travel of the boat has a shape of a right angle triangle
To find the total distance, first, we will find the length of the hypotenuse
So, as shown and using the Pythagorean theorem the hypotenuse will be =
![\sqrt[]{4^2+5^2}=\sqrt[]{16+25}=\sqrt[]{41}=6.4](https://img.qammunity.org/2023/formulas/mathematics/college/uz45650pehl6t9smh0jr7onb42cu0u37vk.png)
So, the total distance = the perimeter of the triangle =

Rounding to the nearest mile
So, the answer will be option C) 15 miles