Queue simulation: arrivals served by counters/rides/doctors in time slots

CAT has tested this idea 22 times across 5 papers, from 2017 to 2023. Solve one, and the others are the same method with different numbers or wording, which is why repeated concepts are the most efficient thing to practise.

Question	What it asks	Answer
CAT 2023 Slot 1 · DILR Q11	Visa office: 15-minute slots, category counters, FCFS	0
CAT 2023 Slot 1 · DILR Q12	Visa office: 15-minute slots, category counters, FCFS	200
CAT 2023 Slot 1 · DILR Q13	Visa office: 15-minute slots, category counters, FCFS	D
CAT 2023 Slot 1 · DILR Q14	Visa office: 15-minute slots, category counters, FCFS	D
CAT 2023 Slot 1 · DILR Q15	Visa office: 15-minute slots, category counters, FCFS	D
CAT 2023 Slot 2 · DILR Q16	Park rides, gates every 30 minutes, visitor queues	B
CAT 2023 Slot 2 · DILR Q17	Park rides, gates every 30 minutes, visitor queues	B
CAT 2023 Slot 2 · DILR Q18	Park rides, gates every 30 minutes, visitor queues	B
CAT 2023 Slot 2 · DILR Q19	Park rides, gates every 30 minutes, visitor queues	6
CAT 2023 Slot 2 · DILR Q20	Park rides, gates every 30 minutes, visitor queues	140
CAT 2019 Slot 2 · DILR Q13	Three doctors, tokens, fixed consultation times	C
CAT 2019 Slot 2 · DILR Q14	Three doctors, tokens, fixed consultation times	A
CAT 2019 Slot 2 · DILR Q15	Three doctors, tokens, fixed consultation times	D
CAT 2019 Slot 2 · DILR Q16	Three doctors, tokens, fixed consultation times	D
CAT 2017 Slot 1 · DILR Q13	Two employees and a fryer preparing orders in sequence	B
CAT 2017 Slot 1 · DILR Q14	Two employees and a fryer preparing orders in sequence	C
CAT 2017 Slot 1 · DILR Q15	Two employees and a fryer preparing orders in sequence	A
CAT 2017 Slot 1 · DILR Q16	Two employees and a fryer preparing orders in sequence	B
CAT 2018 Slot 2 · DILR Q21	Candidates' arrival log assigned to three interview rooms	C
CAT 2018 Slot 2 · DILR Q22	Candidates' arrival log assigned to three interview rooms	A
CAT 2018 Slot 2 · DILR Q23	Candidates' arrival log assigned to three interview rooms	A
CAT 2018 Slot 2 · DILR Q24	Candidates' arrival log assigned to three interview rooms	A

Part of Scheduling (41 questions since 2017).