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The link A-R is instantaneous , but the R->B link transmits only 1 packet each second , one at a time . Assume A sends to B using sliding window protocol with window size =4 , For time t=2 , state what packets arrive at R and what are the packets present in the queue at R ?

In this case , what is the transmission time and propogation delay ?

i assumed pd =1 sec md trans delay negligible for link R-B

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Why can't we take transmission delay as 1 second here because it says that one packet is transmitted after every 1 sec ?
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ya if u assuming it as transmitting tym than p.d is negligible so.....soln  also same but here we need to consider  1 sec to transit the ack at receiver side.......becz nothing is clearly mentioned in question