Given that
internal radius of hollow cylindrical pipe, r = 30 cm
Thickness of the hollow cylindrical pipe , w = 5 cm
Let length of the hollow cylindrical pipe be= h
External radius, R = 30 + 5 = 35 cm
Hence volume of cuboid = volume of hollow cylinder
440 × 260 ×100 = π(R2 – r2) h
⇒ 440 × 260 × 100 = 22/7(352 – 302)h
⇒ 440 × 260 × 100 = 22/7(325)h
∴ h = 11200 cm = 112 m