Answer:
200 miles
Step-by-step explanation:
(Let m represent the number of miles)
60 + 15 + 0.75m  =  55 + 0.85m
75 + 0.75m  =  55 + 0.85m
75 - 55 + 0.75m  =  55 - 55 + 0.85m
20 + 0.75m  =  0.85m
20 + 0.75m - 0.75m  =  0.85m - 0.75m
20 Â = Â 0.1m
20/0.1 Â = Â 0.1m/0.1
m  =  200