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 20 km, if the person completes half of the distance by walking and the other half by running?	Choose the correct option
A) 2.75 B) 3.25 C) 3.75 D) 4.25 E) 4.75
time = 10/4 + 10/8 = 30/8= 
<gadget id="calculator">30/8</gadget>
<output>15/4 = around 3.75</output>
3.75 hours   The answer is 3.75.
<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 20 km, if the person completes half of the distance by walking and the other half by running?