Question 1120738
Let {{{s}}} = the speed of the boat going downstream
{{{ 2s }}} = the speed going upstream
Let {{{ c }}} = the speed of the current
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Equation for going downstream
(1) {{{ 24 = ( s + c )*4 }}}
Equation for going upstream
(2) {{{ 24 = ( 2s - c )*4 }}}
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(1) {{{ s + c = 6 }}}
(2) {{{ 2s - c = 6 }}}
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Add the equations
{{{ 3s = 12 }}}
{{{ s = 4 }}}
And
(1) {{{ 4 + c = 6 }}}
(1) {{{ c = 2 }}}
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The rate of the current was 2 mi/hr
She was rowing at a rate of 4 mi/hr going downstream