Two cars A and B start from two places at the same time and drive toward each other. The speed of A car is 85 km/h, and the speed of B car is 110 km/h. After 4 hours, the two cars meet on the way. How many miles is the road between the two places?
甲、乙两辆汽车同时从两地出发，相向而行，甲车的速度是85千米/时，乙车的速度是110千米/时，经过4小时两车在途中相遇．两地间的公路长多少千米？
<gadget id="calculator">85 + 110</gadget>
<output>195</output>

<gadget id="calculator">195 * 4</gadget>
<output>780</output>

<result>780</result>