Please show formula

A cleaning tool requires a constant two minutes to polish a part. Parts arrive at the tool for processing at the rate of 1 part every 4 minutes. a. The cleaning tool is busy % of the time. (Enter your response rounded to one decimal place.) b. The average number of parts waiting to be cleaned is c. The average number of parts in the cleaning process is d. The average time a part waits to be polished is e. The average time spent in the cleaning system is (Enter your response rounded to two decimal places.) (Enter your response rounded to two decimal places.) minute(s). (Enter your response rounded to one decimal place.) minute(s). (Enter your response rounded to one decimal place.)