The distance between A and B is 1800 kilometers. A and B set off from A and B at the same time. If they are walking towards each other, they will meet each other in 12 minutes; if they are traveling in the same direction, A will catch up with B in 90 minutes. How many minutes does it take A to travel from A to B?
A、B两地相距1800千米，甲乙两人同时从A、B两地出发，若相向而行，12分钟相遇；若同向而行，90分钟甲追上乙．甲从A地出发走到B地要用几分钟？
<gadget id="calculator">1_800 / 12</gadget>
<output>150</output>

<gadget id="calculator">1_800 / 90</gadget>
<output>20</output>

<gadget id="calculator">150 + 20</gadget>
<output>170</output>

<gadget id="calculator">170 / 2</gadget>
<output>85</output>

<gadget id="calculator">1_800 / 85</gadget>
<output>360/17 = around 21.176471</output>

<result>360/17 = around 21.176471</result>