The angle of elevation of a ladder leaning against a wall

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The angle of elevation of a ladder leaning against a wall is 60º and the foot of the ladder is 12.4 m away from the wall. The length of the ladder is :

1. 14.8 m
2. 24.8 m
3. 6.2 m
4. 12.4 m

Correct Option: B

Consider the diagram is shown above where PR represents the ladder and RQ represent the wall.
Cos 60° = PQ / PR
⇒ 1 / 2 = 12.4 / PR
⇒ PR = 2 × 12.4 = 24.8 m