Midpoint

Suppose $X_1,X_2 \sim \text{Exp}(\lambda)$ IID. Let $O_1$ and $O_2$ be the minimum and maximum order statistics, respectively. Find the probability that the range of $X_1$ and $X_2$ i.e. $O_2 - O_1$ is larger than their midpoint (defined as $\frac{O_1 + O_2}{2}$) when $\lambda = 3$