A solid iron cuboidal block of dimensions 4.4 m×2.6 m×1 m is recasted into a hollow cylindrical pipe of internal radius 30 cm and thickness 5 cm. The length of the pipe is ________.
Since the pipe is obtained from the block, volume of both objects will be exactly equal to each other.
Volume of cuboid
Volume of cylinder
where Ro and Ri indicate outside radius and inside radius respectively.
[NOTE : 1 m=100 cm]
⇒h=440 × 260 × 100 × 722×325
⇒ h=11200 cm
Hence, the length of the pipe is 112 m.