We know that transmission time Tx=L/B where L is the frame size and B is the bandwidth.
In Csma/Cd, in order to find out the min frame size L, we equate it with the bandwidth delay product and obtain the formula L=BR(R is the round trip time).
R=L/B
R=2Tp (Tp is the one way propagation delay) and Tp is the function of distance between sender and receiver and propagation speed.
Hence Tp=L/(2B)
How is this possible that the Tx and R has the same formula and Tp becomes the function of L and B?
Please clear me this thing .