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82 and one half percent of 400 = 33082 1/2 % of 400= 82.5% * 400= 0.825 * 400= 330
1 and 1/2 hours after 4 am is 5:30 am.
There are 5280 feet in one mile. Therefore, 400 miles per hour is equal to 400 x 5280 = 2112000 feet per hour.
One hour is 60 minutes so one and a half hour is 60 + 30=90 minutes
15 min.