Two passenger and freight vehicles respectively depart from A and B at the same time, and leave opposite to each other. When they meet, the passenger vehicle travels the entire distance (3/5). It is known that the passenger vehicle will travel 12 hours and the freight vehicle travels 120 kilometers per hour. Find the passenger vehicle speed.
客货两车分别从A、B两城同时出发，相对开出，相遇时客车行全程的(3/5)，已知客车行完全程要12小时，货车每小时行120千米，求客车的速度．
<gadget id="calculator">120 / 2</gadget>
<output>60</output>

<gadget id="calculator">60 * 3</gadget>
<output>180</output>

<result>180</result>