Xiaohong and Xiaolan set off from their own home at the same time and walked towards each other's home. After a while, Xiaohong is still (1/15) kilometers away from Xiaolan's house, and Xiaolan is still (1/5) kilometers away from Xiaohong's house. Which of them walked faster? How many kilometers did you walk?
小红和小兰同时从自己家出发，向对方家走去．一段时间后，小红离小兰家还有(1/15)千米，小兰离小红家还有(1/5)千米．她们俩谁走得快些？多走了多少千米？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

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

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