The expressway in a certain province used to be only 231 kilometers long, but now the length of the expressway is four times that of the original. How many kilometers are there highways in this province now?
某省高速公路原来只有231千米，现在高速公路的长度是原来的4倍．现在该省高速公路有多少千米？
<gadget id="calculator">231 * 4</gadget>
<output>924</output>

<result>924</result>