pls solve clearly

4. An operator is currently operating two machines. Because of an increase in sales the company wishes to have the operator run the maximum number of machines without having machine idle time. The union opposes such a move, arguing that the operator should have idle time during a cycle. After con- siderable controversy, the company and union agree the operator will handle the maximum number of machines that will allow the operator to be idle at least 3 minutes per cycle. A time study is made, and the following standard times are determined for a cycle under the existing assignment of two machines: Activity Standard Time (min) 2.00 Unload, load, and start M-1 Inspect parts and package. Walk to M-2 0.80 0.20 Wait for M-2 to stop 3.50 Unload, load, and start M-2 2.00 0.80 Inspect part and package Walk to M-1 0.20 Wait for M-1 to stop 3.50 Based on the time-study data and the agreement between the company and the union, how many machines should be assigned the operator