Water is leaking out of a container. at 2: 30 p. m., there are 31 pints of water in the container. at 4 p. m., there are 22 pints of water in the container. if the water continues leaking out of the container at the same rate, how much water will be in the container at 6: 30 p. m.?

a. 37 pints
b. 7 pints
c. 17 pints
d. 19 pints