The outer diameter of a car tire is 1.2 meters. If the wheel rotates 5 times per second on average, how many seconds does it take to pass the 942-meter bridge?
一辆汽车轮胎的外直径是1.2米，如果车轮平均每秒转5周，它要通过942米的大桥大约需要多少秒．
<gadget id="calculator">3.14 * 1.2 * 5</gadget>
<output>18.84</output>

<gadget id="calculator">942 / 18.84</gadget>
<output>50</output>

<result>50</result>