It takes 12 hours to travel from A to B by a passenger car at a speed of 60 kilometers per hour. If you switch to a train, you can arrive at B 6 hours earlier. What is the speed of the train?
乘坐一辆客车以每小时60千米的速度从甲地开往乙地，要用12小时，如果改用火车可提前6小时到达乙地，求火车的速度？
<gadget id="calculator">60 * 12</gadget>
<output>720</output>

<gadget id="calculator">12 - 6</gadget>
<output>6</output>

<gadget id="calculator">720 / 6</gadget>
<output>120</output>

<result>120</result>