An expedition team wants to cross a mountain. They set off at 8:00 in the morning, travel 3.6 kilometers per hour, and rest for 1 hour when they reach the top of the mountain. Go down the mountain 2 kilometers per hour more than up the mountain, and reach the bottom of the mountain at 2:00 pm. A total of 22 kilometers in total. How many kilometers did the expedition travel less uphill than downhill?
某探险队要越过一座山，他们上午8：00出发，每小时行3.6千米，到达山顶时休息1小时．下山比上山每小时多行2千米，下午2：00到达山底．全程共行22千米．这个探险队上山比下山少行多少千米？
<gadget id="calculator">21.6 / 2</gadget>
<output>10.8</output>

<gadget id="calculator">22 - 10.8 - 10.8</gadget>
<output>0.4</output>

<result>0.4</result>