The outer diameter of a car wheel is 8 decimeters, it rotates 300 times per minute, how many meters does it travel per minute?
一辆汽车的车轮外直径是8分米，它每分钟转动300周，每分钟走多少米？
<gadget id="calculator">8 / 10</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">3.14 * (4/5) * 300</gadget>
<output>753.6</output>

<result>753.6</result>