Chemistry, 18.03.2021 02:10, TheHomieJaay3092

7. Two bells ring at an interval of 30 minutes and 40 minutes to change the lessons in lower and upper primary respectively,
a) After how long will they ring together at the same time?
b) If they first ring together at 9:15 a. m. at what time will they ring together again?

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7. Two bells ring at an interval of 30 minutes and 40 minutes to change the lessons in lower and up...