A man performs 3/5 of the total journey by rail, 17/20 by bus and the remaining 6.5 km on foot. His total journey is :  Choose the correct answer:
A) 125 km	B) 130 km	C) 135 km	D) 140 km	E) none

Rationale: "sol . let the total journey be x km . then 3 x / 5 + 7 x / 20 + 6.5 = x ⇔ 12 x + 7 x + 20 * 6.5 = 20 x ⇔ x = 130 km . answer b"
Answer: B