Mattie Evans drove 140 miles in the same amount of time that it took tubropropellar plane to travel 500 miles. The speed of the plane was 180 mps faster than the speed of the car. Find the speed of the plane.

Answer 1

180 m/s = 402 mi/hr
time = distance/speed, so
500/x = 140/(x-402)
x = 558 mi/hr
You can convert that back to m/s if you want, but the mish-mash of units is just paperwork.