The big and small rollers roll from one end of a slide to the other. The big roller rolls 40 times, and the small roller rolls 50 times. It is known that the diameter of the large roller is 3 cm longer than the diameter of the small roller, how long is this slideway?
大、小两个滚轮从一条滑道的一端滚向另一端，大滚轮滚了40圈，小滚轮滚了50圈．已知大滚轮直径比小滚轮直径长3厘米，这条滑道有多长？
<gadget id="calculator">3.14 * 12 * 50</gadget>
<output>1_884</output>

<result>1_884</result>