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 12 km, if the person completes half of the distance by walking and the other half by running?	Select the correct option:
A) 1.25	B) 1.75	C) 2.25	D) 2.75	E) 3.25
time = 6/4 + 6/8 = 18/8= 
<gadget id="calculator">18/8</gadget>
<output>9/4 = around 2.25</output>
2.25 hours   The answer is 2.25.
<result>C</result>
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 12 km, if the person completes half of the distance by walking and the other half by running?