The highway between A and B is 285 kilometers long. Two passenger and freight vehicles depart from A and B respectively at the same time and drive toward each other. After 3 hours, the two vehicles meet. It is known that the passenger car travels 45 kilometers per hour, how many kilometers per hour does the truck travel?
甲、乙两地的公路长285千米，客、货两车分别从甲、乙两地同时出发，相向而行，经过3小时两车相遇．已知客车每小时行45千米，货车每小时行多少千米？
<gadget id="calculator">45 * 3</gadget>
<output>135</output>

<gadget id="calculator">285 - 135</gadget>
<output>150</output>

<gadget id="calculator">150 / 3</gadget>
<output>50</output>

<result>50</result>