21. Anant started answering mathematics test
sometime between 2:00 p.m. and 3:00 p.m. and
ended at sometime between 5:00 p.m. and 6:00 p.m. If it
is known that the position of the minute hand and the
hour hand at the start interchanged with the position at
the end, for how long did Anant take the test?
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