Aboat has a speed of 5 mph in calm water. it takes the boat 3 hours to travel upstream but only 2 hours to travel the same distance downstream. using the data in the table, what is the value of c, the speed of the current?

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.