Créate an equation that describes the greatest horizontal length, H, in terms of the greatest vertical length, V

Bradley hikes 12 miles in 3 hours. in relation to bradley’s hike, which statement describes the expression

Apatient is to be given 35 milligrams of demerol every 4 hours. you have demerol 50 milligrams/milliliter in stock. how many milliliters should be given per dose?

Precalculus question, image attached.