On a 400-meter circular runway, A and B are 100 meters apart. A runs 5 meters per second, and B runs 3 meters per second. They stop for 5 seconds every time they run 100 meters. How many seconds does it take for A to catch up with B?
在400米的环行跑道上，甲、乙两人相距100米，甲每秒跑5米，乙每秒跑3米，他俩每跑100米停5秒，甲追上乙要多少秒？
<gadget id="calculator">5 - 3</gadget>
<output>2</output>

<gadget id="calculator">100 / 2</gadget>
<output>50</output>

<gadget id="calculator">2 * 5</gadget>
<output>10</output>

<gadget id="calculator">50 + 10</gadget>
<output>60</output>

<result>60</result>