The speed of the car going up the mountain is 56 kilometers per hour. It takes 5 hours to reach the top of the mountain, and it only takes 4 hours to return to the same road when going down the mountain. How many kilometers per hour does the car travel on average when going downhill?
汽车上山的速度为每小时56千米，行了5小时到达山顶，下山时按原路返回只用了4小时．汽车下山时平均每小时行多少千米？
<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">56 * (5/4)</gadget>
<output>70</output>

<result>70</result>