It usually takes 20 minutes for Xiaowei to walk from his home to Guangdong Beijiang Experimental School. One day he speeds up his walking speed by 1/3. How many minutes does it take him to reach the school?
小伟从家里到广东北江实验学校平时步行需20分钟，某天他把步行速度加快了(1/3)，则他到校所需时间为多少分钟．
<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 + (1/3)</gadget>
<output>4/3 = around 1.333333</output>

<gadget id="calculator">(1/20) * (4/3)</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">1 / (1/15)</gadget>
<output>15</output>

<result>15</result>