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GATE | GATE-IT-2004 | Question 68

  • Last Updated : 14 Feb, 2018

A software project involves execution of 5 tasks T1, T2, T3, T4 and T5 of duration 10, 15, 18, 30 and 40 days, respectively. T2 and T4 can start only after T1 completes. T3 can start after T2 completes. T5 can start only after both T3 and T4 complete. What is the slack time of the task T3 in days?

 
(A) 0
(B) 3
(C) 18
(D) 30


Answer: (A)

Explanation: Given, T1=10 ; T2=15; T3=18; T4=30;T5=40

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T3 : EST =10+15 = 25   //T1 and T2 complete before



T5: EST =10+15+18=43

T3: LST =43-18=25
Slack time = EST-LST =25-25=0 // For T3

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