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BIOLOGYA fast-food restaurant operates both a drive-through facility and a walk-in facility. On a randomly selected day, let X and Y, respectively, be the proportions of the time that the drive-through and walk-in facilities are in use, ad suppose that the joint density function of these random variables is $f(x,y)=\frac{2}{3}(x+2y)$, for $0 \leq x \leq 1$, $0 \leq y \leq 1$, f(x,y)=0, elsewhere.} Find the covariance of the random variables X and Y.