A car drives from place A to place B. It is planned to complete the trip in 5 hours, but the actual trip is completed in 4 hours. How much has the actual speed increased?
一辆汽车从甲地开往乙地，计划5小时行完，实际4小时行完，实际的速度提高了多少．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

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

<gadget id="calculator">(1/4) - (1/5)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">(1/20) / (1/5)</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>