Please provide the solution for the below:

Shown below is the graph of the flow rate f() of a pipe, in gallons per minute. Here, t = the number of minutes. Using this information, find / f(1) di, which gives the total number of gallons of water that flowed through this pipe in 7 minutes. y A 3 2 Velocity (Gallons/Minute) 0 2 3 5 6 7 X -1 Time (In Minutes) [ f() dt = 16 gallons [ f(t) dt = 18 gallons [ f(t) di = 15 gallons [ f(1) dt = 17 gallons