7 h - 47 min = -40
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There are 60 minutes in each hour. Therefore, 4 hr and 47 minutes there are (3 X 60) + 47 min = 227 min.
1 day = 24 hrs, and 1 hr=60 min. Therefore 1 day=1440 min. Therefore 1 day + 4 hrs + 7 min equals 1440 min + 240 min+ 7 min or 1687 minutes. Applying the same principal to the other side of the equation gets us 360 min + 20 min or 380 min. 1687 minutes - 380 minutes = 1307 minutes. This equals 21 hrs 47 min.
My guess is 7.3 hours. Heh. Really, 7 h 18 min.
47 * 7 = 329
There are 90 minutes in an hour and a half.