Consider sending a large file from a host to another over a TCP connection that has no

Question:

Consider sending a large file from a host to another over a TCP connection that has no loss.
a. Suppose TCP uses AIMD for its congestion control without slow start. Assuming cwnd increases by I MSS every time a batch of ACKs is received and assuming approximately constant round-trip times, how long does it take for cwnd increase from 5 MSS to 11 MSS (assuming no loss events)?
b. What is the average throughout (in terms of MSS and RTT) for this connection up through time =6 RTT?