The total length of the Beijing-Tianjin high-speed railway is 120 kilometers, and the total length of the Beijing-Shanghai high-speed railway is about 1320 kilometers. If the train travels at a speed of 400 km/h, how much longer will it take to travel from Beijing to Shanghai than to Tianjin?
京津高速铁路全长120千米，京沪高铁全长约1320千米．若列车全程以400千米/小时的速度行驶，从北京到上海比到天津多用多少时间？
<gadget id="calculator">1_320 - 120</gadget>
<output>1_200</output>

<gadget id="calculator">1_200 / 400</gadget>
<output>3</output>

<result>3</result>