A period of 400 years contains 97 leap years. There are 24 hours in one day, 365 days in a regular year and 366 days in a leap year. Therefore, a period of 400 years will contain a total of ((400 - 97) x 24 x 365) + (97 x 24 x 366) = 3506328 hours.
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400 ÷ 60 = 6 hours 40 minutes
Three hours
60 minutes = 1 hour so 400 min = 400/60 = 6.66... hours. Simple!
There are 100 years in a century. Therefore, 400 years is equal to 400/100 = 4 centuries.
97 years