IBM Company Numerical Ability Time and Work

A man can do a piece of work in 5 days, but with the help pf his son, he can do it in 3 days. In what time can the son do it alone?
A. 6x1/2 days B. 7 days
C. 7x1/2 days D. 8 days

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IBM Other Question
A, B and C are employed to do a piece of work for Rs.529. A and B together are supposed to do 19/23 of the work and Band C together 8/23 of the work. What amount should A be paid?
A. Rs.315 B. Rs.345
C. Rs.355 D. Rs.375 Kim can do a work in 3 days while David can do the same work in 2 days. Both of them finish the work together and get Rs.150. What is the share of Kim?
A. Rs.30 B. Rs.60
C. Rs.70 D. Rs.75