It takes 4 hours for a passenger car to travel from A to B, and 5 hours for a truck to travel from B to A. The speed of the passenger car is the speed of the truck.
客车从甲地开往乙地要行4小时，货车从乙地开往甲地要行5小时，客车的速度是货车的多少．
<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>5/4 = around 1.25</output>

<result>5/4 = around 1.25</result>