book Maths Puzzle Numerical Ability

How would you solve this problem? The perimeter of the cover of an address book is 14 inches, and the diagonal measures 5 inches. What are the length and width of the cover?

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If three times a number added to 10 is divided by the number plus 1, the result is four thirds. Find the number a fly wheel has 72 teeth and a starter drivegear has 15 teeth. Find the ratio of fly wheel teeth to drive gear teeth.