# 19. If X is the time difference between the earliest and latest times that an activity...

19. If X is the time difference between the earliest and latest times that an activity can be done and Y is the time it takes to do the activity. What is the time X - Y for the activity? (Place answer on 'answer sheet) 20. Determining the schedule of a project begins by examining each activity in the to determine its relationship to the other activities. (Place answer on answer sheet)

Answering the first Question i.e. 19.

19.

For the given activity, every activity have tow parameters whose are

execution time - e

arrival time - a

For the activity,

Earliest time for the activity is = a + d

Latest time of the activity = a + e

X

= difference of the earliest stime - lastest time

= d - e

Y is defined as the time it takes to do an activity which is equal to the execution time -  arrival time  i.e a -  e

X - Y = d - e - a +  e = d - a

This is equal to the response time of the activity.

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