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3 bells ring together at 7 AM. First bell rings after every 1 hour, second bell rings after every 2 hours and third bell rings after every 4 hours. At what time will they ring together?

3 bells ring together at 7 AM. First bell rings after every 1 hour, second bell rings after every 2 hours and third bell rings after every 4 hours. At what time will they ring together? Correct Answer 11 AM

Given:

Interval of ringing 3 bells are 1 hr, 2 hrs and 4 hrs.

Calculation:

Here, we need to find LCM of ringing hours = LCM = 4

Thus, bells ring together after 4 hours = 7 AM + 4 hours = 11 AM

∴ At 11 AM all the three bells ring together.

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