need help asap please

A cleaning tool requires a constant three minutes to polish a part. Parts arrive at the tool for processing at the rate of 1 part every 15 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 (Enter your response rounded to two decimal places.) c. The average number of parts in the cleaning process is (Enter your response rounded to two decimal places.) d. The average time a part waits to be polished is minute(s). (Enter your response rounded to one decimal place.) e. The average time spent in the cleaning system is minute(s). (Enter your response rounded to one decimal place.)