Your time equation is


 = .


Cancel the common factor 125 in both sides to get


 = 


Solve it to find x, the speed of the plane A.


Your next step in the solution is cross-multiplying.

Let time taken by each be T

Then we get the following SPEED/RATE equation: , which can be reduced to: 

Solve this for T, the time each takes, which by the way is the same. 

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