book Maths Puzzle Numerical Ability

A plane can travel 800mph with the wind and 720mph against the wind. Find the speed of the wind and the speed of the plane in still air.

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book Other Question

Factor x squared minus 9 over 3x minus 9. I am having a really hard time with this problem can someone help me? My Q is Simplify the expression 6 to the square root of 2/ the square root of 3? ( this is a fraction) Please if you are able to help me please.