exam Maths Puzzle Numerical Ability

A plane flies 480 miles with the wind and 320 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 distance between the points (4,-3)and (x,3) is 10. find X


i am coming up with +12 the answer should be -4,

Thanks how do I find the inverse of x->3x??? and x->3x-5
Is there a formula I can use? thankyou