The diameter is 1.5 meters, and it turns 8 times per minute. How many meters does the road roller advance per minute?
直径是1.5米，每分转8圈，压路机每分前进多少米？
<gadget id="calculator">3.14 * 1.5 * 8</gadget>
<output>37.68</output>

<result>37.68</result>