Qingqing just needs to climb over a hill from her home to school. She goes uphill at 50 meters per minute, and her downhill speed is 40% faster than her uphill. The distance from home to school is 2800 meters, and it takes 50 minutes to go to school. How long does it take to get home from school?
青青从家到学校正好要翻过一座小山，她上坡每分钟行50米，下坡速度比上坡快40%，从家到学校的路程是2800米，上学要用50分钟．从学校回家要用多长时间？
<gadget id="calculator">2_800 / 50</gadget>
<output>56</output>

<gadget id="calculator">56 - 50</gadget>
<output>6</output>

<gadget id="calculator">1 / 50</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 + (2/5)</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">50 * (7/5)</gadget>
<output>70</output>

<gadget id="calculator">1 / 70</gadget>
<output>1/70 = around 0.014286</output>

<gadget id="calculator">(1/50) - (1/70)</gadget>
<output>1/175 = around 0.005714</output>

<gadget id="calculator">6 / (1/175) / 50</gadget>
<output>21</output>

<gadget id="calculator">6 / (1/175)</gadget>
<output>1_050</output>

<gadget id="calculator">2_800 - 1_050</gadget>
<output>1_750</output>

<gadget id="calculator">1_750 / 70</gadget>
<output>25</output>

<gadget id="calculator">21 + 25</gadget>
<output>46</output>

<result>46</result>