i only need sndwers not explanations thanks !!

A manufacturing facility needs the raw material (A, B, C and D) to undergo two processes, grinding and deburring. The estimated job time required (in hours) are detailed below. Determine the make-span. a) 6 hours b) 9 hours c) 29 hours d) 32 hours Determine the total idle time at Deburring process. a) 6 hours b) 9 hours c) 29 hours d) 32 hours