The outer diameter of a car tire is 2 meters. If it rotates 5 times per second on average, how many seconds does it take to pass a 942-meter-long bridge?
一辆汽车轮胎的外直径是2米，如果平均每秒转5圈，那么通过一座长942米的大桥，需要多少秒？
<gadget id="calculator">3.14 * 2 * 5</gadget>
<output>31.4</output>

<gadget id="calculator">942 / 31.4</gadget>
<output>30</output>

<result>30</result>