A battery was charged. When the charging began, it was 23 percent full. After 30 minutes of charging, the battery was 89 percent full. How fast was the battery charged? And How long did it take the battery to be fully charged?
+36916 from 23% to 89% is 66% in 30 mins (which is 1/2 hr)
66% /30min = 2.2% per minute
from 23 to 100 % is 77%
77% / (2.2% /min) = 35 mins
