If a person walks at 12 km/hr instead of 8 km/hr, he would have walked 20 km more. The actual distance traveled by him is?  Choose the most appropriate option
A) 50 km B) 58 km C) 60 km D) 40 km E) 65 km

Rationale: "let the actual distance traveled be x km . then , x / 8 = ( x + 20 ) / 12 3 x - 2 x = 40 = > x = 40 km . answer : d"
Answer: D