It takes a person 20 minutes to cross a small hill. He walks 80 meters per minute uphill and 102 meters per minute downhill. The uphill walk is 220 meters shorter than the downhill walk. How many meters is the road up the hill?
某人过一个小山坡共用了20分钟，他上坡每分钟走80米，下坡每分钟走了102米，上坡路比下坡路少走220米．这段小山坡上山的路长多少米？
<gadget id="calculator">220 / 102</gadget>
<output>110/51 = around 2.156863</output>

<gadget id="calculator">20 - (110/51)</gadget>
<output>910/51 = around 17.843137</output>

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

<gadget id="calculator">1 / 102</gadget>
<output>1/102 = around 0.009804</output>

<gadget id="calculator">(1/80) + (1/102)</gadget>
<output>91/4_080 = around 0.022304</output>

<gadget id="calculator">(910/51) / (91/4_080)</gadget>
<output>800</output>

<result>800</result>