In the GO back N sliding window protocol the value of N is 70% of the factor 'a: Where 'a' is the ratio of propagation time to the transmission time. The efficiency of GBN is 30 %. What will be the...

In the GO back N sliding window protocol the value of N is 70% of the factor 'a: Where 'a' is the ratio of propagation time to the transmission time. The efficiency of GBN is 30 %. What will be the transmission time in a micro sec of the protocol where the length of the channel is 900 m and the speed on which signal propagates is similar to the speed of light in a vacuum?