To travel a certain distance, A takes 8 hours to complete the journey, and B takes 5 hours to complete the journey. How much slower is A than B?
行一段路，甲要8小时行完，乙要5小时行完，甲比乙慢多少．
<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">(1/5) - (1/8)</gadget>
<output>3/40 = around 0.075</output>

<gadget id="calculator">(3/40) / (1/5)</gadget>
<output>3/8 = around 0.375</output>

<result>3/8 = around 0.375</result>