Correlation of overlapping Brownian sums

Let $\{W(t) : t \ge 0\}$ be a standard Brownian motion, with $W(0) = 0$. Define $Z_1 = W(1) + W(2)$ and $Z_2 = W(2) + W(3)$. Let $\rho$ be the correlation coefficient between $Z_1$ and $Z_2$. Then the value of $10\rho$ is ________ (round off to two decimal places).