Answer by  
                                                                                          Clement (1453)
                                                            
                          
                          
                                                          Typically it continues and says that say Jane would paint the house in, say, 8 hours, and asks how fast Joe and Jane will paint the house together. Observe in one hour Joe paints 1/6 of the house and Jane 1/8, together they paint 7/24 in one hour, i. e. , they need 24/7 hours.