. Three bells commence tolling together and each toll after 30 minutes, 1 hour and 45 minutes. After what interval will they again toll together ? (1) 3 hrs (2) 150 mts (3) 2 hrs and 40 mts (4) 200 mts
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2 hrs and 40 mts
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In 30 minutes, how many times do they toll together ? Explanation: L.C.M. of 2, 4, 6, 8, 10, 12 is 120. So, the bells will toll together after every 120 seconds(2 minutes).
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