Computer Network. Please help

Suppose within your Web browser you click on a link to obtain a Web page. The IP address for the associated URL is not cached in your local host, so a DNS lookup is necessary to obtain the IP address. Assume you are doing your own DNS resolution. Suppose that n DNS servers are visited before you resolve the IP address; the successive visits incur different RTTs. Further suppose that the Web page associated with the link contains the main HTML and six small objects all of which are on the same server. Here assume that getting the 6 objects and the HTML incur the same RTT. Assume zero transmission time to transfer the objects. Recall that transmission time is the time to receive the rest of the bytes after the first byte of data has been received.

The question is to estimate the total time it takes from the client clicks on the link until the client receives *all* elements of the page (6 objects + main HTML)?

Answer this question assuming (a) Non-persistent HTTP with no parallel TCP connections or pipelining (essentially HTTP/1.0) (b) Persistent HTTP without pipelining or parallelization (c) Persistent HTTP with the browser configured for a maximum of 6 parallel connections but no pipelining. Make assumptions if you need to. Explain your answer.