A train used to take 6 hours from point A to point B, but now it only takes 4 hours. How much more time was spent in the past than in the present?
一列火车原来从A地到B地要6时，现在只要4时．原来用的时间比现在用的时间多百分之几？
<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<gadget id="calculator">2 / 4</gadget>
<output>1/2 = around 0.5</output>

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