Quantitative Aptitude Algebra Quadratic Equation

Let m and n be the roots of the equation px2 + qx + r = 0 where p is non zero. If p,q,r are in A.P. and 1/m + 1/n = 4 then the difference between the roots is ?

1
√51/3
2
√51/9
3
√52/3
4
√52/9
5
√53/3

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