The average current passing through a device is given by:
I = Q/Δt
I is the average current
Q is the amount of charge that has passed through the device
Δt is the amount of elapsed time
Given values:
I = 800.00A
Δt = 1.2min = 72s
Plug in the values and solve for Q:
800.00 = Q/72
Q = 57600C