train of passenger cars and a train of freight trains leave from A and B at the same time. After 3 hours, the distance between the two cars is still 144 km. After driving for another 2 hours, the distance between the two cars is 144 km. The speed ratio is 5:4, how many kilometers does the bus travel per hour?
一列客车和一列货车同时从甲、乙两地相向开出，3小时后两车之间还相距144千米，接着又行驶了2小时，两车之间又相距144千米，客车和货车的速度比是5：4，客车每小时行多少千米？
<gadget id="calculator">144 + 144</gadget>
<output>288</output>

<gadget id="calculator">288 / 2</gadget>
<output>144</output>

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

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

<gadget id="calculator">144 * (5/9)</gadget>
<output>80</output>

<result>80</result>