The distance between A and B is 150 km. A car drives from place A to place B. After driving for 3 hours, it is still 15 kilometers away from place B. How many miles per hour does the car travel on average?
甲、乙两地相距150千米．一辆汽车从甲地开往乙地，行了3小时后，离乙地还有15千米．这辆汽车平均每小时行多少千米？
<gadget id="calculator">150 - 15</gadget>
<output>135</output>

<gadget id="calculator">135 / 3</gadget>
<output>45</output>

<result>45</result>