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Using Pythagoras theorem the base diagonal is given by square root of (15 squared + 20 squared)

base diagonal will therefore be equal to square root of (225+400) =25 inches

taking the base diagonal and the height of the box and applying Pythagoras theorem we have,

space diagonal= square root of (25squared + 60 squared) = 65 inches

therefore your answer is 65 inches

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