填空题
The following is part of a bus timetable. Express buses do not stop at some of the towns between Dawtry and Saresbury. DAWTRY 07:50 08:30 09:10 09:50 TAMSVILLE 07:59 … … 10:00 BRISTOWN 08:07 08:42 … 10:08 JAMCASTER 08:24 08:55 09:27 10:25 SARESBURY 08:33 09:04 09:36 10:33 How much less time does it take to travel on the fastest express bus from Dawtry to Saresbury than it does on a slow (non-express) bus?