Answer:
option B
Step-by-step explanation:
given,
two plane are moving in same altitude at a distance of 1.0 km apart.
angle of depression of the two planes given are 45° and 37°
now, the diagram is attached below
using diagram,
now in ΔAOC
tan 45° =

x = h..................(1)
now using triangle ΔBOD
tan 37° =

from equation (1)
0.754 =

0.754 h + 753.56 = h
0.246 h = 753.56
h = 3063.5 m
hence, the correct answer is option B