Question 418323
Let {{{c}}} rate of boat in still water
Let {{{r}}} = rate of river
given:
downstream:
{{{ 72 = (c + r) * 3 }}}
(1) {{{24 = c + r }}}
upstream:
{{{ 60  = (c - r) * 6 }}}
(2) {{{10 = c - r }}}
Add (1) and (2)
{{{34 = 2c }}}
{{{c = 17}}}
and
{{{24 = 17 + r }}}
{{{r = 7}}}
You just used {{{r}}} for the boat and {{{c}}} for the river
Same answer -OK