A subway line is divided into two parts, the elevated line and the underground line. The elevated line is 16.5 kilometers long, and the length of the underground line is 1.6 times that of the elevated line. How long is this subway line in kilometers?
一条地铁线分高架线和地下线两部分，其中高架线16.5千米，地下线的长度是高架线的1.6倍，这条地铁线全长多少千米？
<gadget id="calculator">16.5 * 1.6</gadget>
<output>26.4</output>

<gadget id="calculator">26.4 + 16.5</gadget>
<output>42.9</output>

<result>42.9</result>