$2.$ Define at what moment will begin and end the processing of the btch lot in the fifth

technological operation with sequential movement of material flow. Benchmark data: batch size $-8$ un$..$

operations $-8,$ t$=8$ min.. t$,=18$ min.. t$3=4$ min., t$=21$ min., ts$=8$ min. t$6=11$ min., t$7=18$ min.. t$8=5$ min.