Radar Question ATPL
Hi,
Need help solving this problem.
Q. A radar antenna rotates at 15rpm. It has a pulse width of 2 microseconds, and a beam width of 3 degrees. Two aircraft are flying towards the antenna at the same speed and initial range, but separated laterally by 1nm. At what range from the antenna will the radar first be able to distinguish between the two aircraft?
Possible answer choices:
a) 15nm
b) 20nm
c) 30nm
d) 45nm
Thanks....