On Ashok Marg three consecutive traffic change after 36,42 and 72 secs respectively. If the lights are first switched on at 9:00 A.M. sharp, at what time will they change simultaneously?
IMO STD IX
Answer:
LCM of 36, 42 and 72 = 504 secs
= 8 mins and 24 secs
So, the time at which they will change simultaneously = 9: 08: 24 A.M.
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