Answer :
2 feet is the hight/depth
volume=legnth times wdth times height
if he digs 2 feet more, he will dig 2 height
assuming the hole is the same width and legtn
volume of dirt taken out mre=40*10.5*2=840 ft^2
volume=legnth times wdth times height
if he digs 2 feet more, he will dig 2 height
assuming the hole is the same width and legtn
volume of dirt taken out mre=40*10.5*2=840 ft^2