Q:

There are two temples, one on each bank of a river just opposite to each other. One temple is 54m high. From the top of this temple, the angles of depression of the top and the foot of the other temple are 30° and 60° respectively. The length of the other temple is; 

• 1
  36√3 m
• 2
  18√3 m
• 3
  18 m
• 4
  36 m