The express train and the slow train leave opposite places A and B. If the slow train drives for 2 hours first, when the two trains meet. The slow train passes the midpoint at 48 kilometers; if the express train is driven for 2 hours first, the meeting time is 144 kilometers away from the midpoint. How many kilometers per hour is the fast train faster than the slow train.
快车和慢车从甲、乙两地相对开出，如果慢车先开2小时，两车相遇时．慢车过中点48千米；若快车先开2小时，相遇时距中点144千米，如果同时开，16小时可相遇．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 / 16</gadget>
<output>6</output>

<result>6</result>