The traffic lights at three different signal points change after every 45 seconds, 75 seconds and 90 seconds respectively. If all change simultaneously at 7:20:15 hours, then they will change again simultaneously at = ?
A. 7:28:00 hours
B. 7:27:45 hours
C. 7:27:30 hours
D. 7:27:50 hours
Answer: Option B
Solution(By Examveda Team)
LCM of 45, 75, 90 is 450∴ Traffic lights will change simultaneously after 7 minutes 30 seconds i.e., at 7:27:45 hours
This Question Belongs to Arithmetic Ability >> Problems On H.C.F And L.C.M
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