The bus departs from place A and the truck departs from place B at the same time. After 6 hours, the bus will complete the journey (4/5), and the truck will exceed the midpoint by 120 kilometers. It is known that passenger cars travel 10 kilometers per hour longer than trucks. How many kilometers are there between A and B?
客车从甲地、货车从乙地同时相对开出，6小时后客车行完全程的(4/5)，货车超过中点120千米．已知客车比货车每小时多行10千米．甲、乙两地相距多少千米？
<gadget id="calculator">120 / 6</gadget>
<output>20</output>

<gadget id="calculator">20 + 10</gadget>
<output>30</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(4/5) * (1/6)</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * (1/6)</gadget>
<output>1/12 = around 0.083333</output>

<gadget id="calculator">(2/15) - (1/12)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">30 / (1/20)</gadget>
<output>600</output>

<result>600</result>