Three bell are ringing continuously at intervals of 30.36.45.minutes respectively. At what time will they ring together again if they at 8am
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Answer:
1280
Explanation:
Answer
First , we find the least number which is exactly divisible by the numbers 18,21,28 and 30 . For this , we find the L.C.M of 18,21,28 and 30.
∴ L.C.M =2×2×3×3×5×7=1260
According to given , the required will be 20 more than 1260.
The required number =1260+20=1280
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