Determine the standard time of Ufa, if the universal time is 2 hours 35 minutes. Ufa is in the 4th time zone.

Let’s use the formula to calculate the standard time
Tn = To + n,
where Tn is the standard time, To is the universal time, n is the belt number.
TP = 2 h 35 min + 4 h = 6 h 35 min.

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