During machining, the wear land (h) has been plotted against

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During machining, the wear land (h) has been plotted against machining time (7) as given in the following figure

For a critical wear land of 1.8 mm, the cutting tool life (in min) is

1. 52.00
2. 51.67
3. 51.50
4. 50.00

Correct Option: B

Apply line equation

slope =	2.0 - 0.8	= 0.024
	60 - 10

If wear land = 1.8 mm²

Tool life =	10 + 1.8 -0.8
	0.024

= 51.67 min