Question 263749
Upstream and then downstream
8 and 12 miles per hour
Total time 4 hours.  


If t hours going at 12 mph then 4-t going at 8 mph.

{{{8(4-t)=d=12t}}}

{{{32-8t=12t}}}

{{{32=20t}}}

{{{16=10t}}}

{{{8=5t}}}

{{{t=8/5}}}


distance {{{12t=12(8/5)=96/5=highlight(19.2*miles)}}}