Oil is leaking out of a ruptured tanker at the rate of $r(t) = 50\,e^{-0.02 t}$ thousand liters per minute.

A. At what rate, in thousands of liters per minute, is the oil leaking out
at $t = 0$? rate = thousand liters/min
at $t = 60$? rate = thousand liters/min

B. How many thousands of liters leak out during the first hour?
Number of liters = thousand liters