exam Maths Puzzle Numerical Ability

Prove quadrilateral WXYZ is a trapezoid where W(a,-11b),X(3/4a,3/4b),Y(2a,4b),Z(6a,2b).
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Stan and Hilda can mow the lawn in 40 min if they work together. If Hilda works twice as fast as Stan, how long does it take Stan to one-half of pias age two years from now plus one-third of her age three years ago is 20 yrs. How old is she now?