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
A rectangle has an area of (16p^2-40pr+25r^2)

Find the dimensions of the rectangle. Find the value of x
x-3 over 2 = x over 5