exam Maths Puzzle Numerical Ability

It takes 1 hour longer to fly to St. Paul at 200 mi/h than it does to return at 250 mi/h. How far away is St. Paul?

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exam Other Question

If 3x+2y=18 solve for X in terms of Y, if 3x+2y=18 solve for Y in terms of X y^2+10y+21/y^2+12y+35 please show me how to simplify this expression and how to set it up correctly