Mailbox is opening at regular intervals 3 times a day. The first time is opened at 8:00 and the last at 19:00. Calculate hours when mailbox is opened during day.


T1 = 8:00 Wrong answer
T2 = 13:30 Wrong answer
T3 = 19:00 Wrong answer


Solution in text T__1 =
Solution in text T__2 =
Solution in text T__3 =

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