To dig a canal, 42.1 kilometers have been dug, and the remaining length is 2.2 times the dug length. How many kilometers are left to be dug?
挖一条水渠，已经挖了42.1千米，剩下的长度是已挖的2.2倍，还剩下多少千米没有挖？
<gadget id="calculator">42.1 * 2.2</gadget>
<output>92.62</output>

<result>92.62</result>