for the two rationalexpressions... try factoring the numerators and denominators, then see what common factors will divide out.

1. time = (distance)/(speed)

let s = the plane's top speed

solve for s.

2. (speed)(time) = distance

let s = speed of the commuter plane

2s = speed of the jet

t = time for the commuter plane

3.25 - t = time for the jet

you should be able to substitute 300 for in the second equation ... solve for s.

3. let s = kyle's speed

(time)(speed) = distance

solve for s