SOLUTION
The given increase in radius is 12cm/s
The after 3 secods the radius of the ripple will be

b. A canoe is located at (-36,48)
Consider the image shown below
By using the Pythagorean theorem it follows
![\begin{gathered} R^{}=\sqrt[]{48^2+36^2} \\ R=\sqrt[]{2304+1296} \\ R=\sqrt[]{3600} \\ R=60 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/college/oujul7co2ula3aadmtqhnjew8zrfygsi8f.png)
To get how long it will take the ripple to reach the cone, divide R by 12
This gives

Therefore, it will take the ripple 5 seconds to get to the canoe