The train from Dong Township to Miao Village used to travel 120 kilometers per hour and arrive in 7 hours. After the speed is increased, the train can travel 140 kilometers per hour. How long does it take to travel from Dong Township to Miao Village?
从侗乡开往苗寨的火车，原来每小时行120千米，7小时可以到达．火车提速后，每小时可行140千米，现在从侗乡到苗寨要多少小时？
<gadget id="calculator">7 / 140</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">120 * (1/20)</gadget>
<output>6</output>

<result>6</result>