The diameter of the driving wheel of a train is 0.75 meters. If it turns 800 times per minute, how many kilometers can it travel in one hour?
一列火车主动轮的直径是0.75米，如果每分转800圈，1小时可以行多少千米？
<gadget id="calculator">1 * 1_000</gadget>
<output>1_000</output>

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

<gadget id="calculator">3.14 * 0.75 * 800 * 1 * (3/50)</gadget>
<output>113.04</output>

<result>113.04</result>