A transmitting antenna at the top of a tower has a height 32 m and the height of the receiving antenna is 50 m .What is the maximum distance between them for satisfactory communication in line of sight (LOS) mode ?

Question

$(a)\;55.4\;km\qquad(b)\;45.5\;km\qquad(c)\;54.5\;km\qquad(d)\;455\;km$