I need a detailed soluion with explanation to figure out the following
token ring problem.

A token ring LAN interconnects M stations using a circle topology. 
The token travels around the circle until a station takes it off
inorder to send a packet.  Suppose that it takes S time to travel
around the circle.   Assume that the all packets are 1250 bytes and
that the ring speed is 25 Mbps.  Suppose that at each station, it
takes T seconds to forward the packet.

What is the maximum possible arrival rate that can be supported if
stations are allowed to transmit an unlimited number of packets?

What is the maximum possible arrival rate that can be supported if
stations are allowed to transmit 1 packet using single-packet
operation?  Using multi-token operation?