A person walks at a speed of 4 km/hr and runs at a speed of 8 km/hr. How many hours will the person require to cover a distance of 8 km, if the person completes half of the distance by walking and the other half by running?  Pick: A) 0.5 B) 1.5 C) 2.5 D) 3.5 E) 4.5

Rationale: "time = 4 / 4 + 4 / 8 = 12 / 8 = 1.5 hours the answer is b ."
Answer: B