Word problem help?

Question

Solve:
A turbo-jet flies 50 mph faster thana super-prop plane. If a turbo-jet goes 2000 mi. in 3 hr less than it takes the super-prop to go 2800 mi. find the speed of each plane.

Answer 1

2000/t = 2800/(t -- 50) -- 3
=> 3t^2 -- 950t -- 100000 = 0
whence t = 400 and s = t -- 50 = 350
turbo @ 400 mph and super @ 350 mph

Answer 2

Distance = rate x time
Let the superprop go S miles per hour.
The turbojet goes S+50 mph
2800 = S * T
2000 = (S+50)(T-3)
Solve for S by subbing 2800/S=T in the above eqtn.