A solid iron cuboidal block of dimensions 4.4 m × 2.6 m × 1 m is cast into a hollow cylindrical pipe of internal radius 30 cm and thickness 5 cm. Find the length of the pipe.
Internal radius of cylinde= 30 cm = 0.30 m
Outer radius of cylinder = 30 + 5 = 35 cm = 0.35 m