The highway between A and B is 285 kilometers long. A passenger car and a truck start from A and B 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 miles does the truck travel per hour? (solution by equation)
甲、乙两地的公路长285千米，一辆客车和一辆货车分别从甲、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？(用方程解)
<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>