Given:
Internal radius of pipe (r) = 30 cm
Thickness of the pipe = 5 cm
External radius of the pipe R =30 + 5 = 35 cm
Let the length of the cylindrical pipe be h.
Volume of iron cuboid = l × b × h
= 4.4 × 2.6 × 1 m3
= 4.4 × 2.6 × 1 × 1000000 cm3
∴ The cuboid is melted and recasted into a hollow cylindrical pipe.
∴ Volume of hollow cylindrical pipe = Volume of cuboid
Hence the length of cylindrical pipe = 112 m.