If a person walks at 25 km/hr instead of 10 km/hr, he would have walked 31 km more. The actual distance traveled by him is?
Choose the correct choice from the following answers.
A) 30	B) 25	C) 20.67	D) 12.33	E) 19.48

Rationale: "let the actual distance traveled is ' x ' km then by given conditions , we have x / 10 = ( x + 31 ) / 25 25 x = 10 x + 310 x = 20.67 km ans - c"
Answer: C