Riding a bicycle from place A to place B, Zhang Daming travels (1/3) the whole journey every hour, and Li Xiaowei travels the whole journey (1/5) every hour. Which of the two is faster? How much faster?
骑自行车从甲地到乙地，张大明每时行全程的(1/3)，李小伟每时行全程的(1/5)，两人谁的速度快？快多少？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">(1/3) - (1/5)</gadget>
<output>2/15 = around 0.133333</output>

<result>2/15 = around 0.133333</result>