Afireman is standing 25 m due west of the burning building. if the angle of elevation of the ladder is 51°, how long is his ladder (round to the nearest foot)?

a) 33 meters

b) 34 meters

c) 39 meters

d) 40 meters

Distance from the building where the fireman is standing = 25 m due west
Angle of elevation of the ladder = 51 degrees
Then
Let us assume the length of the ladder = x 
Then
Cos 51 degree = 25/x
0.6293 = 25/x
x = 25/0.6293
   = 39.72 meters
   = 40 meters
From the above deduction, we can conclude that the correct option among all the options given in the question is the fourth option or option "D".