A minute is 60 seconds, so 45 minutes is 45 x 60 = 2700 seconds
An hour is 60 minutes, three hours is 180 minutes but each minute is 60 seconds, so
180 minutes is 180 x 60 = 10800 seconds.
Adding the two we get 10800 + 2700 = 13500 seconds
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2,700 seconds are in 45 min.
1 mi / 45 MPH * 60 min/hr * 60 sec/min = 80 seconds.
1 minute is 60 seconds, so 4 min = 4x60 = 240 sec, and 3/4 minute = 45 sec. Add together to get 285 seconds
About 1,420,092,000 seconds in 45 years.
45 seconds is 0.0125 hours.