Xiao Ming is on the way to school by car, due to traffic jams, the speed of the car is reduced by 20%, so how many times will his time on the way to school be.
小明在上学乘车的路上，因堵车，车速降低了20%，那么他在上学路上的时间是原来的多少倍．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">5 * (4/5)</gadget>
<output>4</output>

<gadget id="calculator">5 / 4 / 1</gadget>
<output>5/4 = around 1.25</output>

<result>5/4 = around 1.25</result>