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To find out how much John earns each hour, we need to divide his total earnings by the number of hours he works.
In a regular work week, John works 5 work days with 8 hours each day, so he works a total of 5*8 = <<5*8=40>>40 hours.
Therefore, John earns $750 / 40 hours = $<<750/40=18.75>>18.75 per hour. Answer: \boxed{18.75}.