A truck wheel has an outer diameter of about 125 cm. If the wheel rotates at an average of 250 revolutions per minute, how many kilometers does the truck travel per hour?
一种卡车车轮，外直径约是125厘米，如果车轮平均每分钟转250转，这辆卡车每小时的行程是多少千米？
<gadget id="calculator">125 / 100</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">60 / 1_000</gadget>
<output>3/50 = around 0.06</output>

<gadget id="calculator">3.14 * (5/4) * 250 * (3/50)</gadget>
<output>58.875</output>

<result>58.875</result>