passenger train and a freight train depart from two cities opposite each other at the same time, and the two trains meet each other in 5 hours. It is known that the speed of the passenger car is 60 kilometers per hour, and the speed of the truck is 70% of the speed of the passenger car. How many kilometers are the distance between the two cities?
一列客车和一列货车同时从两城市相对开出，5小时两车相遇．已知客车的速度是每小时60千米，货车的速度是客车的70%，两城市相距多少千米？
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">60 * (7/10)</gadget>
<output>42</output>

<gadget id="calculator">42 + 60</gadget>
<output>102</output>

<gadget id="calculator">102 * 5</gadget>
<output>510</output>

<result>510</result>