It is known that A travels 10 meters more than B per minute. A and B start from A and B respectively and walk towards each other. If the two start at the same time, they will meet in 30 minutes; if B starts 11 minutes earlier than A, then B will travel 300 meters longer than A when they meet. What is the distance between A and B?
已知甲每分钟比乙多行10米，甲乙两人分别从A，B两地出发相向而行．若是两人同时出发，则30分钟相遇；若是乙比甲早出发11分钟，则相遇时乙比甲多行300米．问A，B两地相距多少米？
<gadget id="calculator">50 + 50 + 10</gadget>
<output>110</output>

<gadget id="calculator">110 * 30</gadget>
<output>3_300</output>

<result>3_300</result>