The distance between Beijing and Hohhot is 660 kilometers. A train departs from Hohhot, traveling 48 kilometers per hour; another train departs from Beijing, traveling 72 kilometers per hour. Two trains leave at the same time, going towards each other, when will they meet? When the two trains met, how many kilometers longer did the train from Beijing travel than the train from Hohhot?
北京和呼和浩特相距660千米．一列火车从呼和浩特开出，每时行驶48千米；另一列火车从北京开出，每时行驶72千米．两列火车同时开出，相向而行，经过几时相遇？两车相遇时，从北京开出的火车比从呼和浩特开出的火车多行了多少千米？
<gadget id="calculator">48 + 72</gadget>
<output>120</output>

<gadget id="calculator">660 / 120</gadget>
<output>11/2 = around 5.5</output>

<gadget id="calculator">72 * (11/2)</gadget>
<output>396</output>

<gadget id="calculator">48 * (11/2)</gadget>
<output>264</output>

<gadget id="calculator">396 - 264</gadget>
<output>132</output>

<result>132</result>