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 16 km , if the person completes half of the distance by walking and the other half by running ?
time = 8 / 4 + 8 / 8 = 3 hours the answer is c .
add(divide(divide(16, const_2), 4), divide(divide(16, const_2), 8))