4/5 is 48 minutes.
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45 km = 28 miles so 45 km per hour = 28 miles per hour.
45 kilometers per hour is the same as 27.9 miles per hour.
0.75 of an hour is 3/4 of an hour or 45 minutes.
There are 45 minutes in 3/4 of an hour because 3/4 times 60 minutes = 45.
105 minutes (1 hour + 45 minutes = 60 minutes + 45 minutes)