its updated now

3. In the figure below, Host A is connected to Host B by a path of 2 links with data rates of R1 = R, and R2 = 0.5R, respectively. Suppose that Host A sends two packets back to back, each packet has L bits, each link has the same propagation delay dprop, and there is no other traffic on the path. Host Host Host @ R, Q R - 1 Host > B (a) Give an expression for the time the last bit of the first transmitted packet reaches Host B. Your answer should be a function of L, R, and dprop. (b) Answer the above question for the second transmitted packet