Dad and Xiao Ming drove to the beach 426 kilometers away from home. They set off at 8:30 in the morning and were 146 kilometers away from the destination at 12:30. How many kilometers does this car travel on average per hour?
爸爸和小明开车前往离家426千米的海滨浴场，上午8：30出发，12：30距离目的地还有146千米，这辆汽车平均每小时行多少千米？
<gadget id="calculator">426 - 146</gadget>
<output>280</output>

<gadget id="calculator">12.5 - 8.5</gadget>
<output>4</output>

<gadget id="calculator">280 / 4</gadget>
<output>70</output>

<result>70</result>