What is the answer to 11:30+2:30 simplified?

11 :30 + 2:30 = 13:30

$${\frac{{\mathtt{11}}}{{\mathtt{30}}}}{\mathtt{\,\small\textbf+\,}}\left({\frac{{\mathtt{2}}}{{\mathtt{30}}}}\right) = {\frac{{\mathtt{13}}}{{\mathtt{30}}}} = {\mathtt{0.433\: \!333\: \!333\: \!333\: \!333\: \!3}}$$