The answer is: 6 hours and 15 minutes
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3 hours 45 minutes.
I believe there is an hour and 45 minutes because 75 means 3 quarters from a 100% and 45 means also 3 quarters from 60 (which are the minutes from an hour) .and therefore...1.75 hours equals an hour and 45 minutes
1 hour and 15 minutes.
6h 10m - 3h 45m = 2h 25m
By writing the 45 minutes as a fraction of an hour. One hour is 60 minutes, so write the 45 over 60 and simplify.