Question 343372
1 ft. = 0.3048 m
4ft = 4*0.3048=1.22m
we assume it is a cylinder of 50000m with diameter 1.22m
radius = 0.61m
volume V = pi*r^2 * h
V= 3.14 *0.61*0.61*50000
V = 58419.7 cu.m of dirt was removed
this is for 1 tunnel
you calculate for 3 tunnels.