The passenger car and the freight train travel in opposite directions from the midpoint of A and B at the same time. When the passenger car arrives at A after 6 hours, the truck is still 60 kilometers away from B. The known speed ratio of the truck to the passenger car is 3: 4. How many kilometers are there between A and B?
客车和火货车同时从甲、乙两地的中点向相反的方向行驶，6小时后客车到达甲地时，货车离乙地还有60千米，已知货车与客车的速度比是3：4，甲乙两地相距多少千米？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 - (3/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">60 / (1/4)</gadget>
<output>240</output>

<gadget id="calculator">240 * 2</gadget>
<output>480</output>

<result>480</result>