Question 1131972
A is headed 45 degrees from some reference direction, and B is headed x degrees with regard to that same reference direction.  Since B is  105 degrees in relation to A,  B is  150 degrees in relation to the reference.


Speed of A:
{{{100/4=25}}} {{{km/hr}}}


Speed of B:
{{{120/4=30}}}{{{km/hr}}}


How far A from B after 2 hours:
{{{d^2=(25*2)^2+(30*2)^2-2*25*30*cos(105)}}}


{{{d=sqrt((25*2)^2+(30*2)^2-2*25*30*cos(105))}}}-------compute this.