The students climbed the mountain at a speed of 60 m/min when going up the mountain, and went back down the mountain at a speed of 80 m/min. The round trip took 70 minutes. How many meters did they climb the mountain? (column equation solution)
同学们爬山，上山的速度是60米/分，下山从原路返回，速度是80米/分，往返一共用了70分钟．他们爬山的路程是多少米？(列方程解答)
<gadget id="calculator">1 / 60</gadget>
<output>1/60 = around 0.016667</output>

<gadget id="calculator">1 / 80</gadget>
<output>1/80 = around 0.0125</output>

<gadget id="calculator">(1/60) + (1/80)</gadget>
<output>7/240 = around 0.029167</output>

<gadget id="calculator">70 / (7/240)</gadget>
<output>2_400</output>

<result>2_400</result>