Three bells ringing at a interval of 6,12,15 minute..at which time all the bells ringing together.?

or:Three bells ringing at a interval of 6,12,15 minute..at which time all the bells ringing together.?or:60 minutes ,120 minutes , 180 minutes , 240

or:Three bells ringing at a interval of 6,12,15 minute..at which time all the bells ringing together.?

or:60 minutes ,120 minutes , 180 minutes , 240 minutes , 300 minutes etc

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