Three bells start ringing together at 8 : 35 am, if they ring after 12, 15 and 18 s respectively each time, the next time they will toll together at 

Three bells start ringing together at 8 : 35 am, if they ring after 12, 15 and 18 s respectively each time, the next time they will toll together at

8 : 38 am

8 : 40 am

8 : 41 am

8 : 45 am

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