Question 1134342
Find x and y coordinates of their
final position. Call their starting point
the origin
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After getting to Mark's house, 
{{{ x = 240 }}}
{{{ y = 0 }}}
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After getting to the bus  station,
{{{ x = 240 + 480/sqrt(2)  }}}
{{{ x = 240 + 339.411 }}}
{{{ x = 579.411 }}}
and
{{{ y = 480 / sqrt(2) }}}
{{{ y = 339.411 }}}
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The bus travels {{{ 880 }}} m north
{{{ x = 579.411 }}}
{{{ y = 339.411 + 880 }}}
{{{ y = 1219.411 }}}
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{{{ d^2 = 579.411^2 + 1219.411^2 }}}
{{{ d^2 = 335717.107 + 1486963.187 }}}
{{{ d = 1350.067 }}} m
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check the math & get a 2nd opinion if needed