The speed of a tractor running at a constant speed on a level ground is 5 meters per second. It is known that the diameter of the front wheel of the tractor is 0.8 meters, and the diameter of the rear wheel is 1.25 meters. Assuming that the contact points of the two wheels with the ground at a certain moment are A and B, then after how many seconds, A and B are in contact with the ground again at the same time? (Pi takes an approximate value of 3)
在水平地面上匀速行驶的拖拉机速度是每秒5米，已知拖拉机前轮直径0.8米，后轮直径1.25米．设某一时刻两轮上与地面的接触点为A和B，那么经过多少秒后，A和B再次同时与地面接触？(圆周率取近似值3)
<gadget id="calculator">60 / 5</gadget>
<output>12</output>

<result>12</result>