student spends 2 hours going up and down the mountain during a mountain climbing activity. If he takes 1.2 hours to go up the mountain and go down the same road, the speed is 3.75 kilometers per hour. What is the speed of the student going up the mountain in kilometers per hour?
一个学生在一次爬山活动中，上下山共用2小时，如果他上山用1.2小时，按原路下山，速度是每小时3.75千米，这个学生上山的速度是每小时多少千米．
<gadget id="calculator">2 - 1.2</gadget>
<output>0.8</output>

<gadget id="calculator">0.8 / 1.2</gadget>
<output>0.666667</output>

<gadget id="calculator">3.75 * 0.666667</gadget>
<output>2.500001</output>

<result>2.500001</result>