From A to B, it takes 4 hours for a bus and 5 hours for a truck. How much faster is the speed of the bus than the speed of the truck?
从甲地到乙地，客车要行4小时，货车要行5小时，客车速度比货车速度快多少．
<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>