SOLUTION: Airplane A travels 6300 km at a certain speed. Plane B travels 4500 km at a speed 50 km/h faster than plane A in 3 hrs less time. Find the speed of each plane.

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Question 1103571: Airplane A travels 6300 km at a certain speed. Plane B travels 4500 km at a speed 50 km/h faster than plane A in 3 hrs less time. Find the speed of each plane.
Answer by josgarithmetic(39630) About Me  (Show Source):
You can put this solution on YOUR website!
              SPEED        TIME       DISTANCE
A             r             t          6300
B             r+50         t-3         4500



--------------------------------
,... three hours less time.
-------------------------------- 

              SPEED        TIME           DISTANCE
A             r             6300/r          6300
B             r+50         4500/(r+50)      4500
Difference                  3

Now only one variable is needed, that of either plane, here choosing r for plane A.
6300%2Fr-4500%2F%28r%2B50%29=3
Solve for r.