The distance between A and B is 3300 meters. A and B are walking towards each other from the two places at the same time. A walks 82 meters per minute, and B walks 83 meters per minute. They have walked for 15 minutes. How many minutes will they have to walk before they meet ?
A、B两地相距3300米，甲、乙两人同时从两地相对而行，甲每分钟走82米，乙每分钟走83米，已经行了15分钟，还要行多少分钟才可以相遇？
<gadget id="calculator">82 + 83</gadget>
<output>165</output>

<gadget id="calculator">3_300 / 165</gadget>
<output>20</output>

<gadget id="calculator">20 - 15</gadget>
<output>5</output>

<result>5</result>