Let the total profit be Rs. z. Then,

Kerry's share = Rs. 2z/3,  Joseph’s share = Rs. ( z - 2z/3 ) = Rs. z/3.

J : K = z/3 : 2z/3 = 1:2

Let the total capital be Rs, X and suppose Kerry's money was used for x months. Then.

(1(x) / 4 * 15) / (3x) / 4 * y) = 1/2 <=> y = (15 * 2 / 3) = 10.

 Thus, Kerry's money was used for 10 months.

             100

             150

             ------

150-------50

100-------? => 331/3%

Let the original salaries of Jack and Jenny’s be Rs. 2x and Rs. 3x respectively.

Then, (2x + 4000)/(3x + 4000) = 40/57

57(2x + 4000) = 40(3x + 4000)

 6x = 68,000

 3x = 34,000

Jenny's present salary = (3x + 4000) = Rs. (34000 + 4000) = Rs. 38,000.

3/5 = 6 /x . X = 10