The outer diameter of a car tire is 1.5 meters. If it rotates 150 times per minute on average, how many kilometers does it travel per hour?
一辆汽车轮胎的外直径是1.5米，如果平均每分转150圈，那么每小时大约行驶多少千米？
<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 * 1.5 * 150 * 1 * (3/50)</gadget>
<output>42.39</output>

<result>42.39</result>