From school to the cinema, A takes 10 minutes and B takes 9 minutes, how much less is the distance traveled by A per minute than the distance traveled by B per minute.
从学校到电影院，甲用10分钟，乙用9分钟，甲每分钟行的路程比乙每分钟行的路程少多少．
<gadget id="calculator">1 / 9</gadget>
<output>1/9 = around 0.111111</output>

<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">(1/9) - (1/10)</gadget>
<output>1/90 = around 0.011111</output>

<gadget id="calculator">(1/90) / (1/9)</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>