It depends on what you want to say
most people say 4 hours
Can be either. eg A 4 hour trip, it take 4 hours from A to B.
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3.4 of an hour is 3.4 hours, or 3 and 4/10 hours, or 3 hours and 24 minutes.
There are 28 quarter hours in 7 hours. This is because there are 4 quarter hours in each hour, and when you multiply 4 by 7, you get 28. Each quarter hour represents 15 minutes, so 28 quarter hours would equal 420 minutes.
15 an hour
1 hour and 15 minutes in fraction = 1 1/4 hours or 5/4 hours1 hour = 60 minutes15 minutes = 15/60 = 1/4 hourthus, 1 hour and 15 minutes = 1 1/4 hours or 5/4 hours
65 miles per hour x 4 hours = 260 miles