Peter travels to work by train and bus every day. He starts work at
different times each day, but sometimes on the hour or sometimes at half
past the hour. He gets to the train station 45 minutes before he is due at
work and the train journey takes 20 minutes, after which he takes a bus
from the station to work which takes 10 minutes. The train leaves every
20 minutes, starting on the hour. Some days Peter finds that he gets to
work 5 minutes early. On all the other days he finds that he gets to work
5 minutes late.
Which one of the following could explain the times that Peter arrives at
work?
A) The buses leave at 5 and 35 past each hour.
B) The buses leave at 15 and 45 past each hour.
C) The buses leave at 25 and 55 past each hour.
D) The buses leave at 5, 25 and 45 past each hour.
E) The buses leave at 15, 35 and 55 past each hour.