Discussion
If Ajay takes 2 hours for B and completes other preceding tasks without delay, when can E start?
Answer: C
E can start at 2 p.m.
A takes 9 to 11 a.m. With B now taking 2 hours, B runs 11 a.m. to 1 p.m., and C, which needs A and B done, runs 1 to 2 p.m. D runs alongside B and C, from 11 a.m., for 3 hours, which ends at 2 p.m. E needs A, B, C and D all complete, so it starts at 2 p.m., when both C and D end.
12 noon and 1 p.m. are too early, since B or C are still running. 3 p.m. would add an hour of idle time that nothing in the information requires.
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