Question 920309
c, flow rate of the river


RT=D basic rule for uniform rates of travel


{{{(5.5+c)*5=d}}} and {{{(5.5-c)*8=d}}}.


{{{(5.5+c)5=(5.5-c)8}}}
{{{27.5+5c=44-8c}}}
{{{13c=44-27.5}}}
{{{highlight(c=1.27)}}}