Xiao Ming goes to climb a mountain, and travels 2.4 kilometers per hour when going up the mountain, and travels 3.6 kilometers per hour along the original road when going down the mountain. It took 5 hours to go up and down the mountain. How many kilometers did Xiao Ming walk in total?
小明去爬山，上山时每小时行2.4千米，下山时沿原路返回每小时行3.6千米．上下山一共用了5小时．小明一共走了多少千米？
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

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

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

<gadget id="calculator">2.4 * 3 * 2</gadget>
<output>14.4</output>

<result>14.4</result>