Barb pulled the plug in her bathtub and it started to drain.

Barb pulled the plug in her bathtub and it started to drain. The amountof water in the bathtub as it drains is represented by the equationL = −5t2 – 8t + 120, where L represents the number of liters of waterin the bathtub and t represents the amount of time, in minutes, sincethe plug was pulled.How many liters of water were in the bathtub when Barb pulled theplug? Show your reasoning.Determine, to the nearest tenth of a minute, the amount of time it takesfor all the water in the bathtub to drain.