5 5 votes 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 $12 : 00$ $\text{PM}$, when will the three bells ring together again the next time? $5 : 00$ $\text{PM}$ $5 : 30$ $\text{PM}$ $6 : 00$ $\text{PM}$ $6 : 30$ $\text{PM}$ Quantitative Aptitude gate2022-ee quantitative-aptitude lcm-hcf + – Arjun 1.3k views answer comment Share Follow 0 reply Please log in or register to add a comment.
4 4 votes Given that, $\text{P}$ is rung every $20$ minutes $\text{Q}$ is rung every $30$ minutes $\text{R}$ is rung every $50$ minutes Now, ${\color{Green}{\text{LCM(20, 30, 50) = 300 minutes = 5 hours}}.}$ If all the three bells are rung at $12: 00\;\text{PM}$, when will after that all the three bells ring together again the next time $ = 12:00\;\text{PM} + 5\;\text{hours} = 5:00\;\text{PM}.$ Correct Answer $:\text{A}$ Lakshman Bhaiya answered Feb 21, 2022 • moved May 13 by Lakshman Bhaiya Lakshman Bhaiya comment Share Follow See all 2 Comments 2 2 Comments reply Aditi Thakur commented Nov 30, 2023 i moved by Arjun May 13 reply Follow flag correction: 20 minutes instead of 50 . 1 1 replyShare Lakshman Bhaiya commented Dec 3, 2023 i moved by Arjun May 13 reply Follow flag @Aditi Thakur Corrected now, thanks 1 1 replyShare Please log in or register to add a comment.
