Xiaoming went to climb the mountain on Sunday, and it took 20 minutes to go uphill, and the speed of going downhill was twice that of uphill, how many minutes did it take to go downhill? (assuming the uphill and downhill distances are the same)
小明周日去爬山，上坡用了20分钟，下坡时速度是上坡的2倍，则下坡用多少分钟？(假设上坡和下坡的路程相同)
<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/20) * 2</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / (1/10)</gadget>
<output>10</output>

<result>10</result>