With the stopper in place and the faucet running a bathtub canbe filled in 16 mi

With the stopper in place and the faucet running a bathtub canbe filled in 16 minutes. With the faucet off and the stopperremoved the tub will empty in 20 minutes. If the faucet is runningand the stopper is not in place how long will it take to fill thetub?