Two people, A and B, go from A to B at the same time. A walks 60 meters per minute, B walks 90 meters per minute, and B returns immediately after arriving at B. Meet A at a distance of 180 meters from B. What is the distance between A and B?
甲、乙二人同时从A地去B地，甲每分走60米，乙每分走90米，乙到达B地后立即返回．在离B地180米处与甲相遇．A、B两地相距多少米．
<gadget id="calculator">180 * 2</gadget>
<output>360</output>

<gadget id="calculator">90 - 60</gadget>
<output>30</output>

<gadget id="calculator">360 / 30</gadget>
<output>12</output>

<gadget id="calculator">90 + 60</gadget>
<output>150</output>

<gadget id="calculator">150 / 2</gadget>
<output>75</output>

<gadget id="calculator">12 * 75</gadget>
<output>900</output>

<result>900</result>