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In a single pass drilling operation, a through hole of $15$ mm diameter is to be drilled in a steel plate of $50$ mm thickness. Drill spindle speed is $500$ rpm, feed is $0.2$ mm/rev and drill point angle is $118^{\circ}$. Assuming $2$ mm clearance at approach and exit, the total drill time (in seconds) is

  1. $35.1$
  2. $32.4$
  3. $31.2$
  4. $30.1$
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