A passenger car travels from A to B at 70 kilometers per hour and takes 2 hours to arrive. How many hours will it take to travel 80 kilometers per hour? (Solve with ratio)
一辆客车从甲地开往乙地，每小时行70千米，2小时可到达．如果每小时行80千米，多少小时可到达？(用比例解)
<gadget id="calculator">70 * 2</gadget>
<output>140</output>

<gadget id="calculator">140 / 80</gadget>
<output>7/4 = around 1.75</output>

<result>7/4 = around 1.75</result>