1.

The traffic signals at four road crossing change every 30 second, 1 minute, 45 seconds and 75 seconds respectively. If they change simultaneously at 9 AM, at what time will they change simultaneously again. (1) 9:12 AM (2) 9.15 AM (3) 9.20 AM (4) 9.30 AM

Answer»

(2) 9.15 AM

LCM of 30 sec, 1 min , 45 sec and 75 sec = 15 min 

∴ at 9:15 AM, they will simultaneously change again



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