Question 1132456
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            This formulation includes tons of data and words that are not relevant to the solution.


            They,  probably,  were specially placed into the formulation to confuse the reader.


            I filtered out all unnecessary words and data,  and below is my dry remainder to solve.



<pre>
    A motor barge traveled 100  miles downstream at a speed of 10 miles per hour.

    The rate of the current is 3 miles per hour.

    How much longer will it take for the barge to return back than to travel downstream ?
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Now I am ready to solve.


<pre>
Since the barge speed downstream is 10 mph, its speed in still water is  10-3 = 7 mph.


Since the barge speed in still water is 7 mph, its speed upstream (relative to the river's banks) is 7-3 = 4 mph.


Time downstream is  {{{100/10}}} = 10 hours.

Time upstream is  {{{100/4}}} = 25 hours.


The difference is 25 - 10 = 15 hours.


<U>ANSWER</U>.  How much longer ? - 15 hours longer.
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