In a mountaineering expedition, it took Xiao Li 5 hours to go up and down the mountain. It is known that his speed up the mountain is 2 kilometers per hour, and his speed down the mountain is 3 kilometers per hour. If he went up and down the mountain by the same road, how many kilometers did he walk up the mountain?
一次登山探险活动，小李上、下山共用了5小时，已知他上山的速度是每小时2千米，下山的速度是每小时3千米．如果上、下山走的是同一条路，那么他上山走了多少千米．
<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">5 * (3/5) * 2</gadget>
<output>6</output>

<result>6</result>