The distance between A and B is 800 kilometers. The car starts from point A. After driving for 3 hours, it is still 160 kilometers away from the midpoint of the two places. Find the average speed of the car.
A、B两地距离800千米，汽车从A点出发，行了3小时后，距离两地中点还有160千米，求汽车的平均速度．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">800 * (1/2)</gadget>
<output>400</output>

<gadget id="calculator">400 - 160</gadget>
<output>240</output>

<gadget id="calculator">240 / 3</gadget>
<output>80</output>

<result>80</result>