How do I solve one fourth of 40

Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?

Adam used 1072.4 gallons of water over the course of 7 days. how much water did adam use, on average, each day?

Rick is driving to his uncles house in greenville, which is 120 miles from ricks town .after covering x miles rick she's a sign stating that greensville is 20 miles away. which equation when solved will give the value of x. a: x+120 = 20 b: x x120 =20 c: x +20 equals 120 d: x x20= 120