Two carriages set off from places A and B at the same time. Grandpa Zhang’s carriage drives from place A to place B at a speed of 12 kilometers per hour, and Grandpa Li’s carriage drives from place B to place B at a speed of 8 kilometers per hour. Jiadi. When the two cars meet, Grandpa Zhang is still 24 kilometers away from City B. How many kilometers is the distance between A and B?
两辆马车同时从甲、乙两地相对出发，张爷爷的马车以12千米/时的速度从甲地开往乙地，李爷爷的马车以8千米/时的速度从乙地开往甲地．两车相遇时，张爷爷离乙城还有24千米，甲、乙两地相距多少千米？
<gadget id="calculator">24 / 8</gadget>
<output>3</output>

<gadget id="calculator">12 + 8</gadget>
<output>20</output>

<gadget id="calculator">3 * 20</gadget>
<output>60</output>

<result>60</result>