Two cars, A and B, start from AB at the same time and drive toward each other. After 4 hours, car A arrives at the midpoint, and car B is 8 kilometers away from the midpoint. The speed ratio of cars A and B is 4:5. How many miles is the distance between A and B?
甲乙两车分别从AB两地同时出发相向而行，4小时后甲车到达中点，乙车离中点8千米．甲乙两车的速度比为4：5．AB两地相距多少千米？
<gadget id="calculator">5 - 4</gadget>
<output>1</output>

<gadget id="calculator">8 / 1</gadget>
<output>8</output>

<gadget id="calculator">8 * 4 * 2</gadget>
<output>64</output>

<result>64</result>