A freight train and a passenger train depart from two places 504 kilometers apart at the same time and meet each other in 4(1/2) hours. The passenger train travels 64 kilometers per hour. How many kilometers per hour does the freight train travel? (column equation solution)
一列货车和一列客车同时从相距504千米的两地相对开出，4(1/2)小时相遇，客车每小时行64千米，货车每小时行多少千米？(列方程解答)
<gadget id="calculator">112 - 64</gadget>
<output>48</output>

<result>48</result>