A train of passenger cars and a train of freight trains run opposite each other from a place at the same time. After 2.5 hours, the distance between the two cars is 357.5 kilometers. It is known that the passenger car travels 78 kilometers per hour, how many kilometers per hour does the truck travel? (Solution of column equation)
一列客车和一列货车同时从甲地相背而行，经过2.5小时后，两车相距357.5千米．已知客车每小时行78千米，货车每小时行多少千米？(列方程解)
<gadget id="calculator">78 * 2.5</gadget>
<output>195</output>

<gadget id="calculator">357.5 - 195</gadget>
<output>162.5</output>

<gadget id="calculator">162.5 / 2.5</gadget>
<output>65</output>

<result>65</result>