Find the speed of the plane.

Question

Mattie Evans drove 140 miles in the same amount of time that it took a turbopropeller plane to travel 440 miles. The speed of the plane was 150 mph faster than the speed of the car.

Answer 1

d = rt

t = d/r

The distances are equal.

140/r = 440/(r + 150)

Cross multiply.

140(r + 150) = 440r

140r + 21,000 = 440r

300r = 21,000

r = 70

70 + 150 = 220 mph

Answer 2

d = r * t

d / r = t

140 / r = t

440 / (r + 150) = t

140 / r = 440 / (r + 150)

Can you solve for r and answer?