The passenger car and the truck travel in opposite directions from the midpoint of A and B at the same time. After 5 hours, the bus arrives at A, and the truck is 60 kilometers away from B. It is known that the speed ratio of the truck to the passenger car is 5:7. Find A, How many kilometers are there between B and B? (column equation solution)
客车和货车同时从甲乙两地的中点向相反方向行驶，5小时后客车到达甲地，货车距乙地还有60千米，已知货车与客车的速度比是5：7，求甲、乙两地相距多少千米？(列方程解答)
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">(1/2) * (5/7)</gadget>
<output>5/14 = around 0.357143</output>

<gadget id="calculator">(1/2) - (5/14)</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">60 / (1/7)</gadget>
<output>420</output>

<result>420</result>