Dear Princezz3286,

Let x = the speed of the boat in still water

Assuming that the speed of the boat in still water is greater than the speed of the river,

\(\displaystyle x+3\) is the net rate of the boat going

*downstream* and \(\displaystyle x-3\) is the rate going

*upstream*. (If you don't assume \(\displaystyle x\) is bigger than \(\displaystyle 3\), then your boat would make no progress--it would travel backwards.)

In your D = R x T table, generally you fill out two of the columns with info from the word problem, and in the remaining column you use the formula d=rt on the two filled-in columns, and put the result in the third column. For example, if you filled in the Rate and Time coulmns, you would multiply those columns to get the Distance column.

Your main trouble is the Time column in your table. Use the formula d=rt to get the Time column after you've filled-in the Distance and Rate.

So, re-think your expressions for the rates, and instead of putting t's in your Time column, put fractions which are your distance/rate expressions.

Does that help enough? Final hint: the rate will be a whole number (not mixed number).

Kasie