This question is designed to be answered without a calculator. A rectangle has a height of 5 cm and its base is increasing at a rate of % cm/min. When its area is 60 cm2, at what rate is the diagonal of the rectangle increasing? a 12 - cm/min 13 x 13 - n 12 cm/ml .\\ 13 - mmln 18 c l a 18 - n 13 cm/mi