The drum of the road roller is 1.5 meters long and the radius of the bottom surface is 0.6 meters. Calculated at 15 revolutions per hour, how many hours will it take to press a roadbed of 25,434 square meters?
压路机的滚筒长1.5米，底面半径0.6米，以每小时转动15周计算，把25434平方米的路基压一遍，需要多少小时？
<gadget id="calculator">3.14 * 0.6 * 2 * 1.5 * 15</gadget>
<output>84.78</output>

<gadget id="calculator">25_434 / 84.78</gadget>
<output>300</output>

<result>300</result>