text: it takes a man 1 hr to dig a hole 2m wide long & deep how long would it take him to dig  hole  4m wide long &d he is digging the same pace and the last word is deep assuming it a cylindrical hole,   in 1hr ---- total volume of hole digged = pi*1*2 (pi*r^2*h) so for the volume of pi*2^2*4 , req. time = pi*4*4/pi*2  => t = 8 hrs