A car travels 68 kilometers per hour when going up the mountain. It takes 5 hours to reach the top of the mountain. It takes 1 hour less to go down the mountain by the same road. How many kilometers per hour does the car travel when going down the mountain?
一辆汽车上山时每小时行驶68千米，5小时到达山顶，按原路下山，少用了1小时，这辆汽车下山的时，每小时行多少千米？
<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>