It takes 5 hours for a passenger car to drive from A to B. When returning from the original road, the speed increases (1/8), how many hours less than when going there.
一辆客车从甲地开往乙地用了5小时，从原路回来时，速度提高了(1/8)，比去时少用多少小时．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 8</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">1 + (1/8)</gadget>
<output>9/8 = around 1.125</output>

<gadget id="calculator">(1/5) * (9/8)</gadget>
<output>9/40 = around 0.225</output>

<gadget id="calculator">1 / (9/40)</gadget>
<output>40/9 = around 4.444444</output>

<gadget id="calculator">5 - (40/9)</gadget>
<output>5/9 = around 0.555556</output>

<result>5/9 = around 0.555556</result>