Bissoy.com
Doctors Medicines MCQs Q&A

Six bells start ringing together and ring at intervals of 4, 8, 10, 12, 15 and 20 seconds respectively. how many times will they ring together in 60 minutes ?

Six bells start ringing together and ring at intervals of 4, 8, 10, 12, 15 and 20 seconds respectively. how many times will they ring together in 60 minutes ? Correct Answer 31

LCM of 4, 8, 10, 12, 15 and 20 = 120120 seconds = 2 minutesHence, all the six bells will ring together in every 2 minutesHence, number of times they will ring together in 60 minutes= $$1 + \frac{{60}}{2}$$
= 31

Related Questions

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?
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?
Five bells begin to toll together at intervals of 9 seconds, 6 seconds, 4 seconds, 10 seconds and 8 seconds respectively. Starting together, how many times will the bells toll together in a span of 1 hour?
Six bells starts ringing logether and ring at intervals of 4, 8, 10, 12, 15 and 20 seconds respectively. How many times will they ring together in 60 minutes?
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:
5 bells ring simultaneously at intervals of 4, 5, 8, 9 and 10 seconds. All the bells start ringing simultaneously. When will they play together next time:
5 bells ring simultaneously at intervals of 5, 6, 8, 9 and 10 seconds. All the bells start ringing simultaneously. When will they play together next time:
Two bells ring at intervals of 63 seconds and 74 seconds. If they both ring at 10 O'clock in the morning together, after how many seconds will they ring together again?
Two bells ring at intervals of 51 seconds and 62 seconds. If they both ring at 10 O'clock in the morning together, after how many seconds will they ring together again?
Two bells ring at intervals of 59 seconds and 70 seconds. If they both ring at 10 O'clock in the morning together, after how many seconds will they ring together again?