Three alarm clocks ring at intervals of 4, 12 and 20 minutes respectively. If they
start ringing together, after how much time will they next ring together?
Share
Three alarm clocks ring at intervals of 4, 12 and 20 minutes respectively. If they
start ringing together, after how much time will they next ring together?
Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Thus, we found the LCM of 4, 12 and 20 to be 2×2×3×5=60 . Hence, the three clocks will ring together after 60 minutes or 1 hour.
Answer:
Clocks will ring together again at L.C.M of 4,12,20
⇒LCM=4×1×3×5=60
⇒ clocks ring together after 60 minutes.