The depth of water in a certain nonuniform container is y = .026 t4 + -1.3 t2 + 70, where depth y is in cm when clock time t is in seconds.

The rate at which water flows from a certain nonuniform cylinder is given by rate = .026 t3 + -1.3 t cm3 per minute, where t is in minutes.  How much do water do you think will flow between clock times t = 6.5 minutes and t = 12.8 minutes?