The local train and the express train leave opposite places A and B. If the slow train departs 2 hours earlier, the local train will exceed the midpoint by 48 kilometers when the two trains meet; if the express train departs 2 hours earlier, the express train will exceed the midpoint by 144 kilometers rice. If two cars start at the same time and can meet each other in 6 hours, how many kilometers per hour is the fast car faster than the slow car?
慢车和快车从A、B两地相对开出，如果慢车先出发2小时，两车相遇时慢车超过中点48千米；若快车先出发2小时，则两车相遇时快车超过中点144千米．如果两车同时出发，6小时可相遇，则快车比慢车每小时快多少千米？
<gadget id="calculator">144 * 2</gadget>
<output>288</output>

<gadget id="calculator">48 * 2</gadget>
<output>96</output>

<gadget id="calculator">288 - 96</gadget>
<output>192</output>

<gadget id="calculator">192 / 2 / 6</gadget>
<output>16</output>

<result>16</result>