Suppose the employees are allowed to process multiple order at a time, but the preference would be to finish orders of clients who placed their orders earlier. Also assume that the fourth client came in only at 10:35. Between 10:00 and 10:30, for how many minutes is exactly one of the employees idle?
Explanation:
Suppose Anish will complete preparation of the burger of client 1 by 10:10. In the meantime, Bani will complete the order of ice-cream of client 1 by 10:02. 3 portions of fries would have been prepared by 10:05.
Bani would be free from 10:02 till 10:05 i.e., for 3 minutes.
At 10:05 when 2nd client's order comes, Bani and fryper would be free but Anish would be occupied. Bani can put the 2 portions of fries in the fryer (completes at 10:10) and start the order of 1 ice-cream of client 2 which will be completed by by 10.07. So the entire order of client 2 will complete by 10:10.
At 10:07 when 3rd client's order comes, Bani would be free but fryer and Anish would be occupied. Bani would start the order of burger and complete it by 10:17. Anish and fryer both would be free at 10:10 and hence Anish can start the order of 1 portion of fries which would complete by 10:15.
Bani would be free from 10:17 till 10:30. Anish would be free from 10:10 till 10:30.
Between 10:10 and 10:30 exactly one employee would be free only between 10:10 and 10:17 i.e., for 7 minutes.
Therefore exactly one employee if idle between 10:02 - 10:05 and 10:10 - 10:17 i.e., total 10 minutes.
Hence, option (b).
Help us build a Free and Comprehensive Preparation portal for various competitive exams by providing us your valuable feedback about Apti4All and how it can be improved.