Question 900576
( north ) / ( west ) = {{{ (1/5) / (3/5) }}}
 {{{ (1/5) / (3/5) = x / 1 }}}
Multiply both sides by {{{ 3/5 }}}
{{{ 1/5 = ( 3/5 )*x }}}
Multiply both sides by {{{ 5 }}}
{{{ 1 = 3x }}}
{{{ x = 1/3 }}}
The ship travels 1/3 mi north for every mile
it travels west