Discussion

Explanation:

​​​​​​​

Let the height of the cylinder be 5h than that of the conical part be 3h.
∴ Height of hole = 13(3h + 5h)
8h3

Radius of cone = radius of cylinder = 8

Let radius of hole = r

Now, 1/2(Total volume – Volume of hole) = Volume of hole

∴ Total volume = 3Volume of hole

∴ π × 82 × 5h + 13 × π × 82 × 3h = 3πr2 8h3

∴ 82 × 6 = 8r2

∴ r2 = 8 × 6

∴ r = 43 cm

Hence, option (a).

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