3 bells toll after every 16, 20 and 28 seconds respectively. If they toll together at 11 am. How many times will they toll together in next 3 hours ?
A. 15
B. 23
C. 19
D. 21
Answer: Option C
Solution(By Examveda Team)
In these type of questions, always try to find out LCM.Now, LCM of 16, 20 and 28 = 560.
In every 560 seconds. bells will toll together.
Time = 3 hours = 3 *3600 seconds.
Thus, no. of times bells toll = (3 * 3600)/560 = 19 times.
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Take LCM of 16, 20 and 28 which is 560.
It means bells toll together in 560 secs.
No of times they toll together in 3 h (3*3600 sec) = (3*3600 )/560 = 19 times.