Answer Happy

The lyrics writer Drew A. Blank and the music composer Sasha
Noyes work for an advertising agency creating songs for radio
commercials. The agency commissions a new song from this team on
average every 7 days. Drew starts writing the lyrics. It takes him
an average of 4 days to write lyrics for one song. Subsequently,
Sasha composes the music based on Drew’s lyrics. It takes him an
average of 5 days to finish this task. Assume that time between
requests by the agency, as well as lyrics writing and music
composing times are exponentially distributed. Any orders for new
songs arriving while Drew is busy wait and are handled in the order
they arrived. Completed lyrics received by Sasha while he is busy
are handled similarly. For simplicity assume that all parties
involved work seven days a week.
What is the throughput of this commercial song creation
process?
What is the capacity of this commercial song creation
process?
On average, how long does the agency have to wait for a
commissioned song to be completed by Sasha from the moment it is
submitted to Drew? final ans