Two people, A and B, start from A and B at the same time and walk toward each other. It is known that A walks 50 meters per minute, and B takes 18 minutes to complete the journey. After 3 minutes of departure, A and B are still 450 meters apart. Ask: How many minutes will it take for A and B to meet each other?
甲、乙两人分别从A、B两地同时出发相向而行，已知甲每分钟走50米，乙走完全程要18分钟，出发3分钟后，甲、乙仍相距450米，问：还要过多少分钟，甲、乙两人才能相遇？
<gadget id="calculator">50 * 3</gadget>
<output>150</output>

<gadget id="calculator">150 + 450</gadget>
<output>600</output>

<gadget id="calculator">3 / 18</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">1 - (1/6)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">600 / (5/6)</gadget>
<output>720</output>

<gadget id="calculator">720 / 18</gadget>
<output>40</output>

<gadget id="calculator">40 + 50</gadget>
<output>90</output>

<gadget id="calculator">720 / 90</gadget>
<output>8</output>

<gadget id="calculator">8 - 3</gadget>
<output>5</output>

<result>5</result>