exam Maths Puzzle Numerical Ability

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if the width of a rectangle is one-third of its length and its length is 12, what is the area of the rectangle?

I am not using any specific book. I am just practicing..

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exam Other Question

If the diagonals of a rhombus are 8 cm and 15 cm long, find the area of the rhombus. A car leaves a city and goes north at a rate of 50 mi/h at 2 P.M. One hour later a second car leaves, traveling south at a rate of 40 mi/h. At what time will the two cars be 320 mi apart?