Question 1039010
It  takes 5 days for a steamboat to travel from A to B along a 
river. It takes 7 days to return from B to A. 
How many days will 
it take for a raft to drift from A to B (all speeds stay constant)?
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Also see the lesson <A HREF=https://www.algebra.com/algebra/homework/word/travel/Unpowered-raft-moving-downstream-along-a-river.lesson>Unpowered raft floating downstream along a river</A> in this site, where similar problem was solved.