The snail went to the ant's house as a guest, and then returned to its own house. The distance between the snail's house and the ant's house was 40 meters. How many meters did it crawl in total?
蜗牛去蚂蚁家做客，然后返回自己家，蜗牛家与蚂蚁家相距40米，它一共爬行了多少米？
<gadget id="calculator">40 * 2</gadget>
<output>80</output>

<result>80</result>