If the Feilu tire is used as the front wheel, it must be scrapped after driving 3,000 kilometers; if it is used as the rear wheel, it must be scrapped after driving 5,000 kilometers. Uncle Li's newly bought electric car is equipped with this kind of tires. If the front and rear tires are used interchangeably, the two tires must be scrapped at the same time for the maximum number of kilometers they can travel.
飞鹿牌轮胎如果当前轮使用，行驶3000千米须报废；如果当后轮使用，行驶5000千米报废．李叔叔新买的电动车装有这种轮胎，把前、后轮胎交换着使用，两只轮胎最多能行驶多少千米须同时报废．
<result>3_750</result>