The speed ratio of cars A and B is 3:5. Car A can travel 248.8 kilometers in 4 hours. One day, when two cars drive from point A to point B, it takes 12 hours for car B to get there. How many hours will it take for car A to get there? reachable.
甲乙两车的速度比是3：5，甲车4小时可以行驶248.8千米，某天两车从A地开往B地，乙车用了12小时就可到达，甲车要用多少小时才可到达．
<gadget id="calculator">5 / 3</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">12 * (5/3)</gadget>
<output>20</output>

<result>20</result>