To complete the same job, A takes 5 hours and B takes 4 hours, how much less time does B take than A?
完成同一件工作，甲用5小时，乙用4小时，乙用的时间比甲少百分之几？
<gadget id="calculator">5 - 4</gadget>
<output>1</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>