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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?
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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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