24 hours in a day and night.
24 x 20 = 480 hours.
So the answer is 20 days are greater than 400 hours.
24÷20=083333 20 hours = .83333 days
400 ÷ 20 = 20 hours (though it is unlikely that the speed would be constant!)
You can multiply the 20 days by the amount of hours in a day.
6 days 15 hours minus 3 days 20 hours equal 2 days 19 hours.
1 day has 24 hours, so 10 days has 240 hours, so 20 days has 480 hours.
138 days and 20 hours.
There are 8 days and 20 hours.
3 days and 20 hours
20 days and 8 hours.
14 days and 20 hours.
54 days and 20 hours
20 days and 9 hours.