Last year, the Ministry of Railways increased the speed across the country. The distance between A and B is 1120 kilometers, and the speed of the train is increased from 140 km/h to 160 km/h. After the speed increase, how many hours will be saved from A to B?
去年铁道部在全国范围内提速，甲、乙两地相距1120千米，火车时速由140千米/时提高到160千米/时，提速后从甲地到乙地少用多少小时．
<gadget id="calculator">1_120 / 140</gadget>
<output>8</output>

<gadget id="calculator">1_120 / 160</gadget>
<output>7</output>

<gadget id="calculator">8 - 7</gadget>
<output>1</output>

<result>1</result>