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420 Points
Joined January 2012
Ok. Nice question. I can give you an estimate based on some general assumptions.
1. The driver has to be at least 20 (the legal age limit for obtaining a commercial vehicle license).
Assumption: The driver isn't breaking the laws of Motor Vehicles Act, 1998.
2. This story dates to at least 10 years ago.
Assumption: If a bus stops to get Petrol (since you have already ruled out that the fuel being diesel or petrol is immaterial), they get a decent amount of it, at least, a litre. Only, 10 years ago; the petrol costed so less.
So, as per today's date; the bus driver is at least 30.
PS: I know that this is a wrong answer.