The number of viewers of a television series introduced several years ago is approximated by the function

N(t) = (60 + 2t)^2/3 (1 < t < 26)

where N(t) (measured in millions) denotes the number of weekly viewers of the series at the end of the t th week.
Find the rate of increase of the weekly audience at the end of week 3 and at the end of week 16. (Round your answers to one decimal place.)