Activity 7-8 is directly preceded by two activities—activity 5-7 and activity 6-7. activity 5-7 has an expected time of five and an es time of six. activity 6-7 has an expected time of seven and an es time of seven. activity 7-8 has an expected time of 10. the es for activity 7-8 is:
a. 11
b. 14
c. 21
d. 24
e. 25

B. 14

Explanation:

ES = early start

ES = finished point of the predecessor activity

Considering we have two activities which are:

5-7 which is expected to start at 6 and finish in 5 thus It will end at 11

6-7 which is expected to start at 7 and has a duration of 7 thus, ending at 14

The 7-8 activity will start as soon as the precedecessor end. These activities are finished at point 14 thus, that is the earliest activity 7-8 can start.

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