alice and beth worked for 10 hours a certain day and produced 5000 books. on the next day alice worked for 5 hrs and beth worked for 4 hrs working at the same rates as previous day. Number of books produced by alice and beth on second day?
andy and ben can finish painting a wall in x hours working together. Andy takes y hours more than ben to finish the same work when both of them work alone.
Number of hours that ben takes to finish the work alone?