Whoever gives me the correct answers I will give brainlyest.

Carlos walks 3 miles every night for exercise. It takes him exactly 56 minutes to finish his walk.

A) Assuming he walks at a constant rate, write a equation to represent how many miles, y, Carlos can walk in x minutes. (answer can be kept as a fraction or rounded correctly to the nearest hundredths place)

B) How many miles can Carlos walk in 18 minutes? (Your answer should be rounded to the nearest tenths or hundredths place).