A train travels 200 km in the same time that a plane covers 700 km. If the speed of the plane is 20 km per hr less than 4 times the speed of the train, find both speeds.
Speed of train = S Speed of plane =4S - 20
200/S =700 / (4S - 20), solve for S
S = 40 km/h - train's speed 40*4 - 20 = 140 km/h - plane's speed.