Two buses, A and B, transport students to the spring outing. Car A travels 60 kilometers per hour, and car B travels 50 kilometers per hour. Car B leaves 1 hour earlier than car A. When car B arrives at the destination, car A There are still 10 kilometers to go. How many kilometers is the round trip for this spring outing?
甲、乙两辆大客车运送同学去春游，甲车每小时行驶60千米，乙车每小时行驶50千米，乙车比甲车早出发1小时，当乙车到达目的地时，甲车还有10千米的路程．这次春游往返全程是多少千米．
<gadget id="calculator">50 - 10</gadget>
<output>40</output>

<gadget id="calculator">60 - 50</gadget>
<output>10</output>

<gadget id="calculator">40 / 10</gadget>
<output>4</output>

<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">50 * 5 * 2</gadget>
<output>500</output>

<result>500</result>