Two people, A and B, set off from A and B at the same time and go towards each other. A’s speed is 11 kilometers per hour, and B’s speed is 15 kilometers per hour. They met on the way and then left. It is known that the distance between the two is 30 kilometers after 4 hours. What is the distance between A and B?
甲、乙两人骑车分别从A、B两地同时出发相向而行，甲时速11千米，乙时速15千米，途中相遇后又离去，已知出发4小时后两人相距30千米，问A、B两地相距多少？
<gadget id="calculator">11 + 15</gadget>
<output>26</output>

<gadget id="calculator">26 * 4</gadget>
<output>104</output>

<gadget id="calculator">104 - 30</gadget>
<output>74</output>

<result>74</result>