Two tanks are used in a processing plant. At 8 a. m., operations begin: the first tank containing 7,650 dl empties completely after 9 hours. At the same time, the second tank fills up: at 11 a. m., it contains 2,225 dl and at 3 p. m., it contains 3,425 dl. How long will the two tanks have the same amount? * a) 4.5 h
b) 5 h
c) 5.5 h
d) 6 a. m.

( if your helping me thank you so much and can you also write all of the steps ) THXX