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A singer sang many famous songs at the following times in his concert:

7:30 pm, 7:50 pm, 8:10 pm, 8:30 pm, pm.

(1)  Fill in the blank with the time pattern.

(2)  If the singer has sung 5 songs since 7:30, what’s the time of the next song? pm

(3) What’s the interval between songs? min