Approximately 44.7 miles.
rapitity
0.6 + 3.5 = 4.1 miles from the garage to the museum (one way). Return trip would equal 8.2 miles.
To calculate the average speed omitting rest stops, you would divide the total distance traveled by the total time spent in motion. For example, if the bus traveled 300 miles in 5 hours, with 3 rest stops of 15 minutes each (45 minutes total), the bus was in motion for 4 hours and 15 minutes. The average speed while the bus was in motion would be 300 miles / 4.25 hours = 70.59 mph.
50 miles per hour
The average speed of the bus is 4.5 miles per hour. This is calculated by dividing the total distance traveled (9 miles) by the total time taken (2 hours).
You would have to know the size and type of engine, the age of the engine, the age of the bus and weight of the bus. As a general rule, a diesel engine on a bus would get around 6-15 miles per gallon.
1025 miles
It depends on the rate and time of the bus
Depends on what charter bus which you did not list.
The most convenient unit to use for speed would be the (kilometer per hour), of which the bus would have averaged a rate of 30.
That would depend on how fast the bus was going.
3o miles