Three alarm bells are set such that they will ring after intervals of 21,28 and 30 minutes. If now time is 1p.m. and all the bells ring together. When will they ring together for the first time from now?
titan0:
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Answered by
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420 min i.e.7 hrs later i.e. 8 o'clock...
❤hope it helps...❤
STEP BY STEP GUIDE:
- take LCM of 21,28 and 30
- change in hrs.
- u will get it..
tysm
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Answered by
0
LCM of 21,28,and 30 .
= 420.
Thus they will again ring together after 420 min = 7 hours .
Hence , the required time is 8pm
tysm
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