We can use unit rates to solve the problem.
The bus travels 36 miles in 45 minutes, so the unit rate is:
36 miles / 45 minutes = 0.8 miles per minute
To find how many miles the bus travels in 60 minutes, we can use the same unit rate:
0.8 miles per minute x 60 minutes = 48 miles
Therefore, the bus travels 48 miles in 60 minutes at this rate.