End to end throughput and bottleneck links

What is the maximum achievable end-end throughput (in Mbps) for each of four client-to-server pairs, assuming that the middle link is fair-shared (i.e., divides its transmission rate equally among the four pairs) link 1 ,link link3 and link4? (in Mbps)

Consider the scenario shown below, with four different servers connected to four different clients over four three-hop paths. The four pairs share a common middle hop with a transmission capacity of R=100Mbps. The four links from the servers to the shared link have a transmission capacity of RS=30Mbps. Each of the four links from the shared middle link to a client has a transmission capacity of RC=80Mbps per second