math
posted by don on .
the day is 1hour 18minutes longer than the night.how long is the day?

1 hour = 60 min
1 day = 24 hours = 24 * 60 = 1440 min
1 hour 18 min = 78 min
D = Day
N = Night
D = N + 78
D + N = 1440 min
N + 78 + N = 1440
2 N + 78 = 1440
2 N = 1440  78 = 1362
N = 1362 / 2 = 681 min
D = N + 78 = 681 + 78 = 759 min
12 * 60 = 720
759  720 = 39
759 min = 12 h 39 min
D = 12 h 39 min