2.30-3.00 = 30mins
3.00-5.00 = 120mins
5.00-5.20 = 20mins
30+120+20 = 170mins
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The answer depends on what you intended by "half past 122".
Half is 30.
40 minutes
Between ten past nine in the morning and fifteen minutes later - (that is twenty five past nine in the morning), there are zero hours and fifteen minutes.
9:20