After the fifth speed increase of the Chinese railway, a train travels from 80 kilometers per hour to 120 kilometers per hour. What percentage is the current speed higher than before?
中国铁路第五次提速后，一列火车由原来的每小时行驶80千米，提速到每小时行驶120千米，现在的速度比原来提高了百分之几？
<gadget id="calculator">120 - 80</gadget>
<output>40</output>

<gadget id="calculator">40 / 80</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>