CareerCup

double angle_in_degree(int hours,int minutes)
{
double value = ((720+(hours%12)*60 - minutes*11)%(720))/2;
return value>180 ? 360-value: value;
}

anyways, this was my answer:
Given 'hr' hours and 'min' minutes, angle = modulus( 0.5*(60*hr-11*min) )

Suppose 0<=hour<12, 0<=min<60
var d = Math.Abs((30*hour + min/2 - 6*min));
if(m%2==0)
return d.ToString() + " degrees";
return d.ToString() + " degrees 30 minutes";

30*hour comes from the hour that has 30 degrees.
6*min comes from minutes because a minute has 6 degrees.
min/2 comes from the fact that the hour hand is moved towards next hour. if min is even, we don't have any minutes in the result. if the min is odd, we have 30 minutes in the result...

public class Clock {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		System.out.println(getAngle(2,11));

	}
	
	public static double getAngle(int hours, int mins) {
		System.out.println(hours * 30.0 + 30.0*mins/60.0);
		System.out.println(mins*360/60);
		
		double angle = Math.abs((hours * 30 + 30.0*mins/60.0) - (mins*360.0/60.0));
		return angle;
		
	}
	

}

An hour hand takes 12hrs to cover 360 degrees
Therefore in 1hr->30 and 1min->0.5

A minute hand takes 60 mins to cover 360 degrees
Therefore 1min-> 6 degrees

So the function to calculate angle with 12 hours clock is

degree between hour and minute hand =

30h + 0.5m - 6m

The first term represents the angle covered by hour hand and the second term represents the additional coverage after 'm' minutes and third term represents the angle covered by minute hand

An hour hand takes 12hrs to cover 360 degrees
Therefore in 1hr->30 and 1min->0.5

A minute hand takes 60 mins to cover 360 degrees
Therefore 1min-> 6 degrees

So the function to calculate angle with 12 hours clock is

degree between hour and minute hand =

30h + 0.5m - 6m

The first term represents the angle covered by hour hand and the second term represents the additional coverage after 'm' minutes and third term represents the angle covered by minute hand

stackoverflow.com/questions/2748965/interview-q-find-angle-between-hour-and-minute-hands-in-an-analog-clock