=> RTT = 4 * Tp
=> 500 * 10-3 = 4 * Tp
=> Tp = 125 * 10-3
=> Tt = 103 / 50 * 103
=> Tt = 20 * 10-2
Time for a frame to reach receiver from sender = Tt + 2 * Tp
=> 2 * 10-2 + 2 * 125 * 10-3
=> 20 * 10-3 + 250 * 10-3
=> 270 * 10-3
Cross Check and point out mistakes if any ?