The distance between cities A and B is 594 kilometers. A bus drives from city A to city B, and a truck drives from city B to city A at the same time. Three hours after the two cars meet, the bus is still 189 kilometers away from City B, and the truck is still 108 kilometers away from City A. So how many miles does the truck travel per hour?
甲、乙两城相距594千米，客车从甲城开往乙城，同时货车从乙城开往甲城．两车相遇后3小时，客车距乙城还有189千米，货车距甲城还有108千米．那么，货车每小时行多少千米．
<gadget id="calculator">594 - 108</gadget>
<output>486</output>

<gadget id="calculator">594 - 189 - 108</gadget>
<output>297</output>

<gadget id="calculator">297 / 3</gadget>
<output>99</output>

<gadget id="calculator">594 / 99</gadget>
<output>6</output>

<gadget id="calculator">6 + 3</gadget>
<output>9</output>

<gadget id="calculator">486 / 9</gadget>
<output>54</output>

<result>54</result>