You have installed a blue-tooth stereo in your car, so you can talk hands-free on your phone. The rate at which the clarity of a call can be modeled by the function \(f(t)=4t+1\), where t is time in minutes and f is the clarity of a call. For your birthday, you get a better quality blue-tooth stereo whose clarity increases at a rate of \(g(t)=t^{2} +4\). What is the difference in the clarity of a call at time t between your new stereo and your old one? When will there be no difference?