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Let Neelam and Sunita together do it in x days and Neelam do it in ( x + 32 ) days `1/10+1/(x+2) = 1/x` ⇒ `(x+32+10)/(10(x+32) ) = 1/x` ⇒ 10 x + 320 = x ² + 42x x² + 32x - 320 = 0 Solving the equation x = 8 Neelam will do it in (8 + 32) = 40 days.
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