Since there are 60 minutes in one hour then 45 minutes is 45/60 = 3/4 hour
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8 hr 40 min + 1 hr 45 min = 10 hr 25 min
Twenty minutes is one third of an hour.
1 mi / 45 MPH * 60 min/hr * 60 sec/min = 80 seconds.
45 minutes is three quarters of an hour.
45 minutes is 3/4 of an hour