Answer:
 In 1 second it Rotates 15× 360 / 60 
 
Explanation:
Wheel Rotates 15 times in 60 seconds 
 
This implies that the wheel completes 
 
15 × 360 degrees in 60 seconds 
 
therefore, 
 
In 1 second it Rotates 15× 360 / 60 
 
=> 15×6 = 90 ° 
 
in 12 seconds , 12×90 = 1080°.