Answer:
18 minutes
Step-by-step explanation:
Given that:
The arrival time = 3 customers / hour
The avg. service rate (s) = 12 minutes per customer
To hour, we have:

s = 5 customers/ hour
Thus, the required average time for a customer needs to wait in line is:

To minutes;

= 18 minutes
Answer:
John did not make a mistake
Step-by-step explanation:
he did everything correct
600(1+0.08/5)^5=649560.3
The valur of Rs 600will decline to 649560.3in 5 years interest is 8%
The correct answer is true since an integer is simply just a number