exam Maths Puzzle Numerical Ability

y=1/2x+2

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M is between L and N on line LN. Find LM and MN if LM = x^2. MN = x^2 + 9x. and LN = 56. sketch. show work. an airplane flies 1449 miles against the wind and 1539 miles with the wind in a total time of 5hours. the speed of the airplane in still air is 600mph. what is the speed of the wind ?