Dr. Long drove to the "Colorful City" to buy toys, but the speed of the car was reduced by (1/5) because the road was being repaired. So, how much does Dr. Long's time on the road increase?
龙博士开车到"彩色城"购买玩具，因途中一路段正在抢修而将车速降低了(1/5)．那么，龙博士在路上的时间增加了多少？
<gadget id="calculator">1 / 5</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">1 / (4/5)</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">(5/4) - 1</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>