The speed of one car is 80 kilometers per hour, and the speed of the other car is 60 kilometers per hour. The two cars start from A and B at the same time and meet each other after 3.5 hours. How many miles is the road between the two places?
一辆车的速度是80千米每小时，另一辆车的速度是60千米每小时，两辆汽车同时从A，B两地出发，3.5小时后相遇．两地之间的公路长是多少千米？
<gadget id="calculator">80 + 60</gadget>
<output>140</output>

<gadget id="calculator">140 * 3.5</gadget>
<output>490</output>

<result>490</result>