exam Maths Puzzle Numerical Ability

find the magnitude of the following vector:
v=3i-2j

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In the Complete Walker III (3rd ed., Knopf, New York, 1984, p. 505), Colin Fletcher's answer to "What games should I take on a scale drawing of a basketball court has a scale of 1 inch : 9 feet. the basketball court is 94 feet by 50 feet. find the dimensions of the court in the drawing.