Question 969896
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A boat goes downstream 72 miles in 3 hours, and travels upstream 60 miles in 6 hours.  
What is the rate of the river, and what is the boat in still water?
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Looking at the solution by @lwsshak3 in his post, I see that the logic 
on how the solution is constructed in the post by @lwsshak3 is the same
which @mananth uses in his solutions to similar problems.


From this fact, I make my conclusion that they both use the same computer code.



Their logic is not effective, and their way solving, in my view, is wrong way teaching.