A fourth of an hour is 60/4=15 minutes, so three quarters of an hour would be 15x3= 45 minutes.
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There are 105 minutes in one and three quarters of an hour, 60 + 45.
There are 45 minutes in three quarters of an hour.
3/4 of an hour is 45 minutes
105 minutes (1 hour + 45 minutes = 60 minutes + 45 minutes)