THE CLOCK AND THE ANGLES

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THE CLOCK AND THE ANGLES The angle between the 2 hands of a clock( circular)... ( ignore seconds hand).....is 30 degrees...( of course 330 deg if seen from the other way)... What is the LEAST time time taken to repeat the angle between them( ie 30 and 330 degrees)??? What is the time if the angle is 60 and 90 degrees respctvly..??? The time should be the exact figure...Of course, u can round off very small fractions..Please give the explainations also...