passenger car and a truck depart from A and B in opposite directions at the same time. It takes 8 hours for the bus to complete the journey, and 10 hours for the truck to complete the journey. After 5 hours, they have crossed and passed 80 kilometers apart. How many miles is the distance between A and B?
客车、货车同时从甲、乙两城相向开出，客车行完全程要8小时，货车行完全程要10小时．5小时后，它们已交叉而过相距80千米．甲、乙两城相距多少千米？
<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/8) + (1/10)</gadget>
<output>9/40 = around 0.225</output>

<gadget id="calculator">(9/40) * 5</gadget>
<output>9/8 = around 1.125</output>

<gadget id="calculator">(9/8) - 1</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">80 / (1/8)</gadget>
<output>640</output>

<result>640</result>