A car travels from A to B, 25% of the way is under construction, and the speed is only 80% of the original speed, so it is 30 minutes late, how long does it take for the whole journey?
一辆汽车从甲地到乙地，途中有25%的地方在修路，速度只有原来的80%，这样就迟到30分钟，原来行全程要多少时间？
<result>480</result>