exam Maths Puzzle Numerical Ability

Okay, second time asking for help with this particular question.
2x+1/x^2-16 [+] x^2-6x-7/x^2-11x+28
I placed the + in [] just so you could tell the two fraction apart, it does not mean anything.

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exam Other Question

This is another one that has me stumped.

Please solve:

1+(a/b) / 1-(a^2/b^2)

Thanx for your help! A plane takes 6 hours to fly from San Francisco to New York, and 5 hours to return back. The wind velocity is 50 miles per hour, from New York to San Francisco. What is the speed of the airplane.