The lone bus traveling on Forgettable route is never on time leaving its terminal; it leaves either early or late. If it leaves early this time then there is only a 15% chance that it would leave...

Extracted text: The lone bus traveling on Forgettable route is never on time leaving its terminal; it leaves either early or late. If it leaves early this time then there is only a 15% chance that it would leave early the next time. On the other hand, if it leaves late this time then there is a 70% chance that it would leave early the next time. In the long run, what proportion of time does the bus leave early?