Consider a random process Z(t) = 2X(t) + 3Y(t), where X(t) and Y(t) are mutually orthogonal stationary random processes with zero mean and autocorrelation functions \({R_{XX}}\left( \tau \right) = 5{e^{ - 2\tau }}\) and \({R_{YY}}\left( \tau \right) = 3\tau + 7\), respectively. The power in Z(t) is: