A passenger car and a truck depart from A and B oppositely at the same time, and they meet on the way after 5 hours. The bus takes 9 hours to complete the journey, and the truck travels 60 kilometers per hour. How many kilometers is the distance between A and B?
一辆客车与一辆货车同时从A、B两地相对开出，5小时后在途中相遇，客车行完全程要9小时，货车每小时行60千米，问AB两地相距多少千米．
<gadget id="calculator">60 * 5</gadget>
<output>300</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">1 - (5/9)</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">300 / (4/9)</gadget>
<output>675</output>

<result>675</result>