Master Li’s home is 15 kilometers away from the factory. How many kilometers did he walk in total from going to work in the morning to leaving get off work in the afternoon?
李师傅家距工厂15千米远，他每天从早上上班到下午下班，共走了多少千米的路？
<gadget id="calculator">15 * 2</gadget>
<output>30</output>

<result>30</result>