and B race around a circular square with a circumference of 1540 meters. It is known that A walks 160 meters per minute, and B's speed is three times that of A. Now A is 260 meters behind B, how many minutes does it take for B to catch up with A?
甲、乙两人绕周长1540米的环形广场竞走，已知甲每分钟走160米，乙的速度是甲的3倍．现在甲在乙后面260米，乙追上甲需要多少分钟？
<gadget id="calculator">1_540 - 260</gadget>
<output>1_280</output>

<gadget id="calculator">160 * 3</gadget>
<output>480</output>

<gadget id="calculator">480 - 160</gadget>
<output>320</output>

<gadget id="calculator">1_280 / 320</gadget>
<output>4</output>

<result>4</result>