1 hour and 21 minutes.
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The answer will depend on 81 what - seconds, hours, days or some other unit.
There are sixty minutes in one hour, so 135 minutes is 135/60 or 2.25 hours.
.81 is how many hours
It is minus 2 hours 28 minutes.
ANSWER:2 hours, 15 minutes. 180 minutes (Which is 3 hours)