Subject
Quantitative Aptitude
Topic
Number
At a telephone exchange, three phones ring at intervals of 20 sec, 24 sec and 30 seconds - If they ring together at 11:25 am, when will they next ring together?
At a telephone exchange, three phones ring at intervals of 20 sec, 24 sec and 30 seconds - If they ring together at 11:25 am, when will they next ring together?
ক)
11:29 pmখ)
11:27 amগ)
11:51 amঘ)
12:29 pmExplanation
Time taken by three phones to ring together = LCM of 20, 24 and 30 ⇒ Time taken by three phones to ring together = 120 seconds (∵ 1 min = 60 seconds) ⇒ Time taken by three phones to ring together = 120/60 = 2 min If the three phones ring together at 11:25 am then they will next ring together after 2 minutes i.e. at 11:27 am. ∴ Time at which the phones next ring together = 11:27 amRelated questions
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