Actually Welcome to the Concept of the Volumes.
==> Volume is Basically defined as the amount of a substance any shape or an object can hold.
==> Volume just can be tendency of any object to hold maximum amount of Substance inside it.
the answer is 3:20 to 6:00 which equals 3 hours and 20 minutes
A table would help to organize more information than a graph would. A graph would help more with numbers.
bearing in mind that a solution to a system of equations is where their graph intersect or meets, Check the picture below.