The circumference of a circular playground is 500 meters. Two students, A and B, walk opposite each other. A walks 56 meters per minute, and B walks 69 meters per minute. How long does it take to meet?
一个环形操场的周长是500米，甲、乙两名学生相背而行．甲每分钟走56米，乙每分钟走69米．经过几分钟才能相遇？
<gadget id="calculator">56 + 69</gadget>
<output>125</output>

<gadget id="calculator">500 / 125</gadget>
<output>4</output>

<result>4</result>