Bissoy.com
Doctors Medicines MCQs Q&A

3 bells ring at the time intervals of 25 minutes, 55 minutes and 45 minutes. At what time will the bells ring together?

3 bells ring at the time intervals of 25 minutes, 55 minutes and 45 minutes. At what time will the bells ring together? Correct Answer 41.25 hours  

Concept Used:

Time when bells ring together is lcm of individual timings of the bells.

Calculations:

Time after which first bell rang = 25 mins

Time after which second bell rang = 55 mins

Time after which third bell rang = 45 mins

Time when all bells will ring together again = LCM of (25, 55, 45)

⇒ Time when all bells will ring together again =2475 mins = 2475/60 hours      

⇒ Time when all bells will ring together again = 41.25 hours      

∴ The bells will ring together again after 41 hours 25 seconds.

Related Questions

Three bells ring simultaneously at 7 p.m. They ring at regular intervals of 15 minutes, 18 minutes and 20 minutes respectively. The time when all the three bells will ring together is:
Five bells ring together and If the bells ring at intervals 5, 15, 20, 25, 30 seconds respectively, after what interval of time will they ring together again.
Four bells toll together at 8 pm. The bells toll every 4 minutes, 6 minutes, 8minutes, and 12 minutes. At what time all the bells will ring together after 8 pm?
Four bells ring at intervals of 5, 10, 12 and 15 minutes respectively. If they start ringing together at 3 o'clock, after what interval of time will they ring together and how many times will they ring together in 18 hours?
Three bells P, Q, and R are rung periodically in a school. P is rung every 20 minutes; Q is rung every 30 minutes and R is rung every 50 minutes. If all the three bells are rung at 12:00 PM, when will the three bells ring together again the next time?  
Three bells ring simultaneously at 10 a.m. They ring at regular intervals of 20 minutes, 30 minutes and 40 minutes respectively. The time when all the three ring together next is
Three bells ring simultaneously at 11 a.m. They ring at regular intervals of 20 min., 30 min., 40 min. respectively. The time when all the three bells ring together next is
A temple has five bells which ring at the intervals of 12, 15, 16, 20 and 25 minutes respectively. If they ring together at midnight, then at what time next will they ring together?
Three bells ring at intervals of 15, 20 and 30 minutes respectively. If they all ring at 11.00 a.m. together, at what time will they next ring together?
Six bells start ringing simultaneously and they ring at intervals of 4, 8, 10, 12, 18 and 20 seconds respectively. Once the ringing starts, how many times will the bells ring together in next 30 minutes?