A, B, and C travel at speeds of 30 meters, 40 meters, and 50 meters per minute respectively. A and B are at A, and C is walking toward each other at B. C meets A 10 minutes after meeting B. What is the length of the road between A and B?
甲、乙、丙三人行的速度分别是每分钟30米、40米、50米，甲、乙在A地，而丙在B地同时相向而行，丙遇乙后10分钟和甲相遇．A、B两地间的路长多少米．
<gadget id="calculator">30 + 50</gadget>
<output>80</output>

<gadget id="calculator">50 * 10</gadget>
<output>500</output>

<gadget id="calculator">40 * 10</gadget>
<output>400</output>

<gadget id="calculator">500 + 400</gadget>
<output>900</output>

<gadget id="calculator">40 - 30</gadget>
<output>10</output>

<gadget id="calculator">900 / 10</gadget>
<output>90</output>

<gadget id="calculator">80 * 90</gadget>
<output>7_200</output>

<result>7_200</result>