pls help with letter h! show all work pls! Will give like

appropriate for the arrival rate and service times are negative exponentially distributed. a) The average time a car is in the system = minutes (round your response to two decimal places). b) The average number of cars in the system = cars (round your response to two decimal places). c) The average number of cars waiting to receive service = cars (round your response to two decimal places). d) The average time a car is in the queue = minutes (round your response to two decimal places). e) The probability that there are no cars at the window =0.7 (round your response to two decimal places). f) The percentage of the time the postal clerk is busy =30% (round your response to the nearest whole number). g) The probability that there are exactly 2 cars in the system = (round your response to three decimal places). h) If a second drive-through window, with its own server, were added, the average time a car is in the system =