During the holiday, Xiao Ming and his father had a very interesting mountaineering exercise. The whole journey was 9.6 kilometers from the bottom of the mountain to the top of the mountain. It took 3 hours to go up the mountain and 2 hours to go down the mountain. What is the average speed of going up and down the hill in km/h?
假期里小明和爸爸进行了一次非常有趣的登山运动，从山底到山顶全程有9.6千米，上山用了3小时，下山用了2小时．上山和下山的平均速度是多少千米/时．
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">9.6 * (2/5)</gadget>
<output>3.84</output>

<result>3.84</result>