Math MCQ: Four Bells commence tolling together and toll at the intervals of 3, 9, 12, 15 seconds respectively. In 30 minutes time, how many times will they toll together ?

Four Bells commence tolling together and toll at the intervals of 3, 9, 12, 15 seconds respectively. In 30 minutes time, how many times will they toll together ?

Correct Answer: 11

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WhatsApp+91 99922 70404Math MCQ: Four Bells commence tolling together and toll at the intervals of 3, 9, 12, 15 seconds respectively. In 30 minutes time, how many times will they toll together ? | Extra Education