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Question
Wilson, Mathan and Guna can complete one round of a circular track in 10, 15 and 20 minutes respectively. If they start together at 7 a.m from the starting point, at what time will they meet together again at the starting point?
Solution
This is an LCM related problem
So, we need to find the LCM of 10, 15 and 20
| 5 | 10, 15, 20 |
| 2 | 2, 3, 4 |
| 1, 3, 2 |
LCM = 5 × 2 × 1 × 3 × 2 = 60 min
They will meet together again after 60 minutes.
ie. 7 a.m + 60 minutes = 8 a.m
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