In junior school the bell rings every 30 min and every 40min at the centre at what times between?
... 8:00 am and 2:30 do the bells both ring at the same time? or:... 8:00 am and 2:30 do the bells both ring at the same time?
... 8:00 am and 2:30 do the bells both ring at the same time?
or:... 8:00 am and 2:30 do the bells both ring at the same time?
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