Question 1195364
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In this post,  two different problems are mixed - - - which makes the whole " problem "  INVALID.


One problem is about crossing the river using a boat,  from one its bank to another.


The other problem is floating downstream at given boat's own speed and added current speed.



When two different problems are mistakenly mixed in one,

the resulting product is only good   to  WHAT ?     to  WHAT ? ?     to  WHAT ? ? ? 



        OK,  in this post my task is to disguise this defective problem's formulation

        (for future generation of students,  who will read it - to save their time and their brain . . . )



It is a surprise to me that the other tutor does not see it . . .