A roller has a length of 1.5 meters and a diameter of 6 meters. If it rotates 100 times per minute, how many square meters of road surface can this roller press per hour?
一台压路机的滚筒长1.5米，直径是6米．如果它每分钟转100圈，那么这种压路机每小时可以压路面多少平方米．
<gadget id="calculator">3.14 * 6 * 1.5</gadget>
<output>28.26</output>

<gadget id="calculator">28.26 * 100 * 60</gadget>
<output>169_560</output>

<result>169_560</result>