The distance between Gaochang and Neijiang is 150 kilometers. A car drove from Gaochang to Neijiang. After driving for 3 hours, it was still 15 kilometers away from Neijiang. How many miles per hour does the car travel on average?
高场到内江相距150千米．一辆汽车从高场出发开往内江，行了3小时后，离内江还有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>