exam Maths Puzzle Numerical Ability

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.

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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. Please help me to understand how to do this...it doesn`t make sense to me. Thank you so very much in advance for helping me. Here is the problem:


3^w * 3^5-w * 3


Thank