A solid cuboid of iron with dimensions 53cm\ast40cm\ast15cm is melted and recasted into a cylindrical pipe. The outer and inner diameters of pipe are 8cm and 7cm respectively. Find the lenght of pipe?

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A solid cuboid of iron with dimensions $53 c m \times 40 c m \times 15 c m$ is melted and recast into a cylindrical pipe. The outer and inner diameters of pipe are 8 cm and 7 cm respectively. Find the length of pipe.

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