A's speed is slower (1/5) than that of B. If B takes 6 hours to complete a section of the road, how many hours does it take A to complete this section of the road?
甲的速度比乙慢(1/5)，如果乙走完一段路要6小时，甲走完这段路需要多少小时．
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<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">(1/6) * (4/5)</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">1 / (2/15)</gadget>
<output>15/2 = around 7.5</output>

<result>15/2 = around 7.5</result>