exam Maths Puzzle Numerical Ability

A plane flies 500 miles with the wind and 340 miles against the wind in the same length of time. If the speed of the wind is 28mph, what is the speed of the plane in still air?

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exam Other Question

The graph of a quadratic function f is the graph of y=-2x^2 translated 4 units to the left and 6 units down. What is the equation of function f? Well, im just having a problem getting the General idea.
Do i combine the Measure of Angle A and B in the problem to = 90?
or do i use one to find the other?
Thanks in Advance