Task: Question Answering
Input (English): Problem: 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 ? 
Options: a ) 1.25 , b ) 1.75 , c ) 2.25 , d ) 2.75 , e ) 3.25
Output (English): c