Two men undertake to do a piece of work for Rs. 1400. The first man alone can do this work in 7 days while the second man alone can do this work in 8 days. If they working together complete this work in 3 days with the help of a boy, how should the money be divided? `R s .600 ,\ R s .550 ,\ R s .250` b. `R s .600 ,\ R s .525 ,\ R s .275` c. `R s .600 ,\ R s .500 ,\ R s .300` d. `R s .500 ,\ R s .525 ,\ R s .375`