book Maths Puzzle Numerical Ability

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.

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book Other Question

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.

Please help.
what is the midpoint of the line segment joining (3,7) and (7,-4)?