So we are given a system:

Substitute x = 2 we get the system:

Multiply the first equation by -5 and the second by 2 we get the system:

Adding the two equations we get :

We find the value of y by using any of the other equations like this:

Final solution:
Volume of cone = 1/3 x pi x r^2 x h
where r = 5 ft and h = 16ft
Volume = 1/3 x pi x 5^2 x 16 = 400/3 π ft^3
convert yards to feet and minutes to seconds
1yard=3ft
16.8yards times 3ft/1yd=50.4ft
1minute=60 seconds
12minutes times 60seconds/1min=720seconds
feet per second=50.4ft/720sec=0.07ft/sec
answer is 0.07ft/sec