Normal combination tail probability

Let $X_{1},X_{2}$ and $X_{3}$ be independent random variables such that $X_{1}\sim N(47,10)$, $X_{2}\sim N(55,15)$ and $X_{3}\sim N(60,14)$. Then $P(X_{1}+X_{2}\ge 2X_{3})$ equals __________ (round off to two decimal places)