It takes a car 10 hours to drive from A to B, but the speed increases by 20% when returning, how many hours will be saved when returning.
一辆汽车从甲地开往乙地用了10小时，返回时速度提高了20%，返回时少用多少小时．
<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">(6/5) / 1</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">10 * (5/6)</gadget>
<output>25/3 = around 8.333333</output>

<gadget id="calculator">10 - (25/3)</gadget>
<output>5/3 = around 1.666667</output>

<result>5/3 = around 1.666667</result>