Two athletes, A and B, are jogging on a circular track with a circumference of 400 meters. It is known that the speed of B is 100 meters per minute, and A's speed is 1.25 times that of B. A is 50 meters in front of B. How long did it take for A to catch up with B for the second time?
甲、乙两位运动员在周长400米的环形跑道上慢跑，已知乙的速度是每分钟100米，甲的速度是乙的1.25倍，甲在乙前面50米．问甲第二次追上乙时一共用了多少时间？
<gadget id="calculator">400 - 50</gadget>
<output>350</output>

<gadget id="calculator">350 + 400</gadget>
<output>750</output>

<gadget id="calculator">100 * 1.25</gadget>
<output>125</output>

<gadget id="calculator">125 - 100</gadget>
<output>25</output>

<gadget id="calculator">750 / 25</gadget>
<output>30</output>

<result>30</result>