Lupert lemon started his two watches at the same time. one is slow and loses two minutes every hour; the other one is fast and gains one minute every hour. how long will it take for thr faster watch to br one hour ahead of the slower watch

Ascientist wants to use a model to present the results of his detailed scientific investigation. why would a model be useful? a )because the model makes the concepts easier to understand b) because the model is easy to put together and to use c) because the model prevents other scientists from asking questions d) because the model requires the audience to pay full attention to it i don't know what to choose because between a and d a is much more likely than d because it only wants to get the attention of the audience. i'm confuse.