Answer:
d. 17
Explanation:
The computation is shown below;
Here the time started i.e. t=0
Therefore there was no customer upto t=5 hour
At t=5
The client first came and as there was no other customer available so we begins service to customer 1
Now
As service off is 4 hour so service to client 1 will end at
t=9 hour.
Also mid-time at t = 6
That means the client 2 came and at t = 8 the client 3 came.
Now at t = 9 the service begins for client 3 and end at t = 13 ( 9 + 4)
At t=13 hour, so after four hours it should be 17
