# QA – Placement Quizzes | Numbers, LCM and HCF | Question 11

Three friends started running together on a circular track at 8:00:00 am. Time taken by them to complete one round of the track is 15 min, 20 min, 30 min respectively. If they run continuously without any halts, then at what time will they meet again at the starting point for the fourth time ?**(A)** 8:30:00 am**(B)** 9:00:00 pm**(C)** 12:00:00 pm**(D)** 12:00:00 am**Answer:** **(C)****Explanation:** LCM (15, 20, 30) = 60

=> They meet at the starting point after every 60 min, i.e., after every 1 hour.

Therefore, they will meet at the starting point for the fourth time after 4 hours, i.e., at 12:00:00 pm.

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