Question 971528
Distance covered by 2nd plane in east direction in 2 hours = 350*2*cos(22.5)
So difference in distance between plane in east direction = 350*2*cos(22.5)-300*2
= {{{100*(7*cos(22.5)- 6)}}}  = a (say)
Difference in distance between the planes in north direction
= {{{350*2*sin(22.5)}}} = b (say)

So distance between planes after 2 hours
 = {{{sqrt(a^2+b^2)}}}