The calculations can get a little tricky for exactness.

For example 7hrs 16 minutes comes up with 122 degrees 7hrs 17 minutes comes up with 116.5 degrees.

At a particular second or fraction of a second between the 2 comes 120 degrees exactly.

So 7hrs 16.362 minutes comes up with 120.009 degrees...close enough.

So at 7:16:21.71 the hour hand and the minute hand will be at 120 degrees.

As the others may well use similar iteration in the absence of some mathematical formula method I will rest my case at this point.

Regards Neil