If a person walks at 12 km/hr instead of 10 km/hr, he would have walked 20 km more. The actual distance traveled by him is:  Choices.
A) 50 km	B) 100 km	C) 60 km	D) 70 km	E) 80 km

Rationale: "let the actual distance travelled be x km . x / 10 = ( x + 20 ) / 12 12 x = 10 x + 200 2 x = 200 x = 100 km . answer : b"
Answer: B