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A hole of $20$ $mm$ diameter is to be drilled in a steel block of $40$ $mm$ thickness. The drilling is performed at rotational speed of $400$ $rpm$ and feed rate of $0.1$ $mm/rev$. The required approach and over run of the drill together is equal to the radius of drill. The drilling time (in minute) is

  1. $1.00$
  2. $1.25$
  3. $1.50$
  4. $1.75$
in Materials, Manufacturing and Industrial Engineering 24.6k points
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