Question 1002525
Basic rules to use, RT=D and Law Of Cosines.


50 minutes is  {{{(5/6)hour}}}.


Let c be distance apart.
{{{highlight_green((55(5/6))^2+(55(5/6))^2-2(55(5/6))(55(5/6))cos(80)=c^2)}}}



The simplification and computation is not done here; but you can and should do them.  Examine the left side expression carefully - SIMPLIFICATION must be emphasized.