8th Grade Algebra
posted by Gabrielle .
I don't know how to do these types of problems whatsoever.
1) It takes a small jet plane 4 hours less time than it takes a propellerdriven plane to travel from Glen Rock to Oakville. The jet plane averages 637 km/h while the propeller plane averages 273 km/h. How far is it from Glen Rock to Oakville?
2)An airplane took 2 hours to fly 600 km against a head wind. The return trip with the wind took 1 2/3 hours. Find the speed of the plane in still air.

Let d be distance.
d=637*Time
d=273*(Time+4)
set them equal to each other, and solve for time. Then solve for d.
2)
600=(Speedheadwind)*2
600=(Speed+headwind)1.66
divide the first equation by 2, and the second by 1.66
add the equations...
300+600/1.66 = 2*Speed
solve for speed 
kjc