book Maths Puzzle Numerical Ability

Sorry I had a wrong email address so here it is agagin;
A sum of $3500 is split between 2 investments, one paying 9% yrly interest the other paying 11%. If the return on th 11% in

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Long-term investing. Sheila invested P dollars at annual rate r for 10 years. At the end of 10 years her investment was worth P(1_r)^10 dollars. She then reinvested this money f The rectangle has a perimeter of 78 centimeters.the length of the rectangle is 11 centimeters longer than triple the width. Find the demensions of the rectangle