A cylindrical tank holds 20,000 gallons of water, which can be drained from the bottom of the tank in 20 minutes. The function gives the volume V of water (in gallons) in the tank at time t in minutes, where time t = 0 corresponds to the instant the tank starts to drain.

At time t = 3 minutes, at what rate is the volume of water in the tank changing?
(Points : 1)
–2200 gallons/minute
1700 gallons/minute
2200 gallons/minute
–1800 gallons/minute
1800 gallons/minute

Question

A cylindrical tank holds 20,000 gallons of water, which can be drained from the bottom of the tank in 20 minutes. The function    gives the volume V of water (in gallons) in the tank at time t in minutes, where time t = 0 corresponds to the instant the tank starts to drain.

At time t = 3 minutes, at what rate is the volume of water in the tank changing?
(Points : 1)
       –2200 gallons/minute
       1700 gallons/minute
       2200 gallons/minute
       –1800 gallons/minute
       1800 gallons/minute