Four different clocks beep after every 25 minutes, 50 minutes, 1 hour 40 minutes and 2 hour 5 minutes. If all clocks beep together at 5 a.m., then when will they next beep together?
Solution
It is mentioned that four clocks beep for every 25 minutes, 50 minutes, 100 minutes and 125 minutes.
All four clocks beep together for every LCM(25,50,100,125) minutes, i.e. 500 minutes.
500 minutes = 8 hours 20 minutes
All clocks next beep together at 5 am + 8 hours 20 minutes, i.e. 1:20 pm.
Answer is option C.
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