The outer diameter of a bicycle tire is 1.12 meters, and it rotates 50 times per minute. How many kilometers does this bicycle travel per hour?
一辆自行车的轮胎的外直径是1.12米，每分转50周，这辆自行车每小时行驶多少千米？
<gadget id="calculator">60 / 1_000</gadget>
<output>3/50 = around 0.06</output>

<gadget id="calculator">3.14 * 1.12 * 50 * 1 * (3/50)</gadget>
<output>10.5504</output>

<result>10.5504</result>