A highway is 336 kilometers long. A bus takes 3.2 hours to complete the journey, and a truck takes 4 hours to complete the journey. How much faster is the passenger car than the truck?
一条高速路长336千米．一辆客车3.2小时行完全程，一辆货车用4小时行完全程．客车的速度比货车的速度快多少？
<gadget id="calculator">336 / 3.2</gadget>
<output>105</output>

<gadget id="calculator">336 / 4</gadget>
<output>84</output>

<gadget id="calculator">105 - 84</gadget>
<output>21</output>

<result>21</result>