A and B race around a circular square with a circumference of 1000 meters. It is known that A walks 125 meters per minute, and B's speed is twice that of A. Now A is 250 meters behind B, how many minutes does it take for B to catch up with A?
甲、乙两人绕周长1000米的环形广场竞走，已知甲每分钟走125米，乙的速度是甲的2倍．现在甲在乙后面250米，乙追上甲需要多少分钟？
<gadget id="calculator">1_000 - 250</gadget>
<output>750</output>

<gadget id="calculator">125 * 2</gadget>
<output>250</output>

<gadget id="calculator">250 - 125</gadget>
<output>125</output>

<gadget id="calculator">750 / 125</gadget>
<output>6</output>

<result>6</result>