A rides a bicycle and B rides a motorcycle and starts from Zhangcun to Lizhuang at the same time. After arriving at Lizhuang, B returns immediately and meets A at a distance of 20 kilometers from Lizhuang. After meeting A and B, they continue to move forward at the same speed. After A arrived at Lizhuang and B arrived at Zhangcun, they both returned immediately. A and B met for the second time 30 kilometers away from Lizhuang, and asked how many kilometers were there between Zhangcun and Licun?
甲骑自行车，乙骑摩托车同时从张村出发去李庄，乙到李庄后，立即返回，在离李庄20千米处与甲相遇，甲、乙相遇后，仍按原来速度前进，甲到李庄，乙到张村后，都立即返回，在离李庄30千米处甲、乙第二次相遇，问张村与李村之间相距多少千米？
<gadget id="calculator">20 + 30 + 20</gadget>
<output>70</output>

<result>70</result>