Cars A and B leave opposite directions at the same time from places A and B respectively, and meet at a distance of 60 kilometers from place A in 4 hours. Meet at 40 kilometers away. How many kilometers are there between A and B?
甲、乙两车分别同时从A、B两地相向开出，4小时在离A地60千米处相遇，相遇后两车继续匀速前进，到达目的地后立即返回，第二次在离A地40千米处相遇．A、B两地相距多少千米？
<gadget id="calculator">60 * 3</gadget>
<output>180</output>

<gadget id="calculator">180 + 40</gadget>
<output>220</output>

<gadget id="calculator">220 / 2</gadget>
<output>110</output>

<result>110</result>