A bus goes from A to B, and a small bus goes from B to A. The speed ratio of large and small passenger cars is 4:5. The two cars set off at the same time and head towards each other. After 60 minutes, they met. After the meeting, the two cars continued to move forward. How much later does the bus arrive at the destination than the small bus?
大客车从甲地去乙地，小客车从乙地到甲地．大小客车的速度比为4：5．两车同时出发相向而行，经过60分钟相遇，相遇后两车继续前进．大客车比小客车晚多少分达到目的地？
<result>27</result>