A car departs from Chongqing, travels 68km per hour, and arrives in Chengdu in 5 hours. If you want to arrive 1 hour earlier, how many kilometers per hour will you travel?
一辆汽车由重庆开出，每小时行68km，5小时到达成都，如果要提前1小时到达，每小时行多少km？
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">68 * (5/4)</gadget>
<output>85</output>

<result>85</result>