The "Flying Eagles" conduct mountaineering training. The team members walk 3.2 kilometers per hour when going up the mountain, reach the top of the mountain in 8.5 hours, and return along the original road. The speed is 1.25 times that of going up the mountain. How many hours did it take to go down the mountain?
"飞鹰队"进行登山训练，队员们上山时每小时行走3.2千米，8.5小时到达山顶，沿原路返回，速度是上山时的1.25倍，下山时用了多少小时？
<gadget id="calculator">3.2 * 8.5</gadget>
<output>27.2</output>

<gadget id="calculator">3.2 * 1.25</gadget>
<output>4</output>

<gadget id="calculator">27.2 / 4</gadget>
<output>6.8</output>

<result>6.8</result>