Clock Hands: 180 Degree Angle in 24 Hours

[mamali]

Homework Statement

Hi , How Many Times in A day 2 of 3 clock hands makes the angle of 180 degree with each other ?

 

[D H]

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[mamali]

I Just Find This Formula :

Angle BetWeen Min And Hour Is : ANGLE = 30H - (11/2)M

But I Do'nt Know how to solve it And Find the H And M That ANGLE=180 ;