The diameter of the train running wheel is 1.5 meters. If it rotates 300 revolutions per minute, how long will it take to travel 28.26 kilometers? ．
火车运动轮的直径是1.5米，如果每分钟转300转，行驶28.26千米，要用多少时间？．
<gadget id="calculator">28.26 * 1_000</gadget>
<output>28_260</output>

<gadget id="calculator">3.14 * 1.5 * 300</gadget>
<output>1_413</output>

<gadget id="calculator">28_260 / 1_413</gadget>
<output>20</output>

<result>20</result>