I really need help fast, these are all 1 question and separated into parts

Question B2 (30 pts): CafeLux is a restaurant in Lincoln famous for its delicious wraps and salads. Jill Gardner, restaurant manager, wants to understand the operational flow in her restaurant. Jill observes that an arriving customer first joins a line to place his/her order and waits in that line for an average of 5 minutes. Next, customer places his/her order, which takes a minute on average. After the order is placed, each customer moves to a different food pick-up section depending on whether customer ordered a wrap or a salad (25% of the customers order wrap and the rest salad). In the pickup section, a customer first joins a line to pick-up his/her food. On average there are 10 customers in the wrap pick up line. Next, customer picks up his/her order, which takes on average a minute for a wrap and 6 minutes for a salad. All customers have their meal in the restaurant. In the dining area there are 60 customers on average. Jill observes that on average 120 customers per hour arrive at the restaurant. Below is the process flow chart, summarizing the data given above. (Assume for simplicity that there are no group arrivals and the process is stable.

a) (8 pts) On average, how many customers are there whether waiting in the order-line A or placing their orders?

b) (8 pts) On average, how long a customer, who ordered a wrap waits in the wrap pick-up line?

c) (8 pts) On average, how long a customer who purchased a wrap spends at CafeLux?

d) (6 pts) On average, how long a customer who purchased a salad spends at Cafelux, if a customer spends on average 54 minutes at CafeLux?

Wrap pick-up section 25% 120 cust/hour Wrap pick-up line 10 customers Pick-up 1 min Order line A 5 min Place order 1 min Dining area 60 customers 75% Salad pick-up line Pick-up 6 min Salad pick-up section Wrap pick-up section 25% 120 cust/hour Wrap pick-up line 10 customers Pick-up 1 min Order line A 5 min Place order 1 min Dining area 60 customers 75% Salad pick-up line Pick-up 6 min Salad pick-up