There are 318 kilometers from place A to place B. A car departs from place A at 8:30, and at 15:30, it is still 24 kilometers away from place B. How many miles per hour does the car travel on average?
从甲地到乙地有318千米，一辆汽车8：30从甲地出发，到15：30时，离乙地还有24千米．这辆汽车平均每小时行多少千米？
<gadget id="calculator">318 - 24</gadget>
<output>294</output>

<gadget id="calculator">294 / 7</gadget>
<output>42</output>

<result>42</result>