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Mindon Min died on 1878-10-01.
Mindon Min was born on 1808-07-08.
min.
10:05 --> 10 * 60 min + 5 min = 605 min
08:20 --> 8 * 60 min + 20 min = 500 min
605 min - 500 min = 105 min (= 1 3/4 hr)
175 min in 175 min.