$.$ A static www page consists of the base file and three objects. The base file and all objects reside

on the same server. The base file willrequire $5[$ms$]$ of transmission time by the server, and each

of the objects referenced in the page requires $10[$ms$]$ transmission time. The RTT between the requesting client host and the server is RTTHTTP $=40[$ms$].$

Calculate the total time needed to download the page from the server $($counted from the first packet

sent by the client host to the server to the last object being completely downloaded to the client$)$

for the following cases of HTTP behaviour:

$($a$)$ Non$-$persistent connection $($each object requires a separate TCP connection$)[3]$

$($b$)$ Persistent connection with the sequential download of objects $[3]$