A man performs 1/2 of the total journey by rail, 1/4 by bus and the remaining 4km on foot. His total journey is  Choose the correct option:
A) 18 km B) 16 km C) 12 km D) 24 km E) 25 km

Rationale: "explanation : let the journey be x km then , 1 x / 2 + 1 x / 4 + 4 = x 3 x + 16 = 4 x x = 16 km answer : option b"
Answer: B