A truck and a bus start from two places A and B at the same time and drive toward each other. When they meet, the bus is 20 kilometers away from the midpoint of the two places. Given that the speed ratio of passenger cars to trucks is 5:4, how many kilometers is the distance between A and B?
一辆货车和一辆客车从甲、乙两地同时出发相向而行，相遇时，客车距两地中点20千米．已知客车与货车的速度比是5：4，则甲乙两地相距多少千米．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(1/2) - (4/9)</gadget>
<output>1/18 = around 0.055556</output>

<gadget id="calculator">20 / (1/18)</gadget>
<output>360</output>

<result>360</result>