Exercise 2: Or a synchronous static time multiplexer with 3 input channels. Channel A debits at 1200 bits/s, channel B at 1200 bits/s and channel C at x bits/s. The bit rate on the composite channel is y bits/s. We assume that channel A sends sequences of 'A', channel B sends sequences of 'B', channel C sends sequences of 'C' and we note that the sequences of characters which pass on the line are always in 'ABCC' order. What are the values of x and y in bits/s? (The multiplexer in this case does not add any additional control elements)."