car has to drive 380 kilometers from place A to the construction site. It has been driven for 4 hours, and it is still 140 kilometers away from the construction site. How many miles per hour does the car travel on average?
一辆汽车从甲地开往工地要行380千米，已开出4小时，离工地还有140千米．这辆汽车平均每小时行多少千米？
<gadget id="calculator">380 - 140</gadget>
<output>240</output>

<gadget id="calculator">240 / 4</gadget>
<output>60</output>

<result>60</result>