Two cars A and B start from the same place in opposite directions at the same time. Car A travels 50 kilometers per hour, and car B travels 60 kilometers per hour. What is the distance between the two cars after 3 hours?
甲、乙两车同时从同一地点相背开出，甲车每小时行50千米，乙车每小时行60千米，3小时后两车相距多少千米．
<gadget id="calculator">50 + 60</gadget>
<output>110</output>

<gadget id="calculator">110 * 3</gadget>
<output>330</output>

<result>330</result>