A can do a work in 30 days, B can do it in 20 days. They together under took to do a piece of work for Rs.1000, what is the share of B? Choose the most appropriate option:
A) rs . 500 B) rs . 400 C) rs . 800 D) rs . 600 E) rs . 200

Rationale: explanation : share of their work days = 30 : 20 share of their work = 20 : 30 share of b ’ s money = 3 / 5 * 1000 = 600 answer : option d
Answer: D