A mechanic works in a shop that uses a flat rate pay system. The flat-rate time for replacing water pump is 2 and 6/10 hours and the flat rate pay is $60. He takes 2 and 1/10 hours to change the water pump on the first car, but 3 and 6/10 hours to change the water pump on a second car (the bolt broke!). He then takes 2 and 3/10 hours to replace the water pump on a third car. How much did he earn for his efforts? What was his hourly wage? If he had worked at exactly the flat rate time for these three water pump replacements, what would his hourly wage have been?