A car goes back and forth between A and B. It takes 6 hours to go, and the speed increases (1/8) when it comes back. How many hours will it take to go back than to go?
一辆汽车往返甲、乙两地，去时用6小时，回来时速度提高(1/8)，那么回来比去时少用多少小时．
<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">6 / (9/8)</gadget>
<output>16/3 = around 5.333333</output>

<gadget id="calculator">6 - (16/3)</gadget>
<output>2/3 = around 0.666667</output>

<result>2/3 = around 0.666667</result>