It used to take 16 hours for the train to travel from city A to city B, but it takes 10 hours after the speed is increased. How much is the speed increased?
火车从甲城到乙城原来需要16小时，提速后需要10小时，速度提高了百分之几？
<gadget id="calculator">1 / 10</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 / 16</gadget>
<output>1/16 = around 0.0625</output>

<gadget id="calculator">(1/10) - (1/16)</gadget>
<output>3/80 = around 0.0375</output>

<gadget id="calculator">(3/80) / (1/16)</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>