Can't figure this one out! I tried, but I have major doubts about my answer:

The number of gallons of water in a tanktminutes after the tank has started to drain isQ(t) = 200(30 - t)^2 . How fast is the water running out at the end 10 minutes? What is the average rate at which the water flows out during the first 10 minutes?

Please respond ASAP! Thanks!