Q4. If in turning of a steel rod by a given cutting tool (material and geometry) at a given machining condition (feed and depth of cut) under a given environment (cutting fluid application), the tool life decreases from 80 min to 20 min. due to increase in cutting velocity, V from 60 m/min to 120 m/min., then at what cutting velocity the life of that tool under the same condition and environment will be 40 min.? Marks (5) CLO (5)