A and B start at the same time at the starting point of the 100-meter runway and walk back and forth. It is known that A walks 40 meters per minute and B walks 60 meters per minute. When the two met face to face for the second time, how many meters were they from the starting point?
甲、乙两人在100米跑道的起点，同时出发，往返行走．已知甲每分钟走40米，乙每分钟走60米．两人第2次迎面相遇时，离起点多少米．
<gadget id="calculator">100 * 4</gadget>
<output>400</output>

<gadget id="calculator">60 + 40</gadget>
<output>100</output>

<gadget id="calculator">400 / 100</gadget>
<output>4</output>

<gadget id="calculator">60 * 4</gadget>
<output>240</output>

<gadget id="calculator">100 * 2</gadget>
<output>200</output>

<gadget id="calculator">240 - 200</gadget>
<output>40</output>

<result>40</result>