3 birds fly along the circumference of a jungle. They complete one round in 27 minutes, 45 minutes and 63 minutes respectively. Since they start together, when will they meet again at the starting position?
Answer: A
We need the instance which means the LCM of times of all 3 birds.
Therefore, LCM = 9 X 3 X 5 X 7 = 945 = 945 minutes