If a person walks at 25 km/hr instead of 10 km/hr, he would have walked 20 km more. The actual distance traveled by him is: Choose the correct choice: A) 50 km B) 56 km C) 13.3 km D) 70 km E) 80 km

Rationale: "let the actual distance travelled be x km . x / 10 = ( x + 20 ) / 25 25 x = 10 x + 200 15 x = 200 x = 13.3 km . answer : c"
Answer: C