Time taken to rotate 90° is 13 seconds
Explanation:
Given:
To complete one revolution, the searchlight takes 52 seconds
One revolution = 360°
So,
360° is completed in 52 seconds
Time taken to complete 90° is [tex]\frac{52}{360} X 90[/tex]
= 13 sec
Therefore, time taken to rotate 90° is 13 seconds