What distance is required to stop a car traveling at 50 mph

Only then does the car begin to slow. On dry pavement that takes 4 1/2 seconds, traveling another 144 feet, but if it's wet, you'll travel 183 feet. You can do the math – it has taken about as long as a football field to stop your car at 55 mph (265 and 303 feet), and that is assuming you were alert

Definition of supplementary angles:

Two Angles are Supplementary when they add up to 180 degrees. Notice that together they make a straight angle.

m∠A +m∠B =180°(1)

We are given :

m∠A is five times the sum of the m∠B plus 7.2°

m∠A = 5(m∠B +7.2) (2)

Plugging value of angle A from equation (2) in (1),

5(m∠B +7.2) + m∠B =180

5m∠B +36 + m∠B =180

6m∠B =180-36

m∠B = 24°

So angle B is 24 degrees.