If a car travels from A to B, and the speed increases by 20% after traveling the entire distance (1/2), how much is the actual travel time reduced compared to the original plan?
一辆汽车从甲地开往乙地，行了全程的(1/2)后，速度提高了20%，那么实际行完全程比原计划的时间减少了多少．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">1 / (6/5)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">1 - (5/6)</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">2 / 1</gadget>
<output>2</output>

<gadget id="calculator">(1/6) / 2</gadget>
<output>1/12 = around 0.083333</output>

<result>1/12 = around 0.083333</result>