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6. Application problems on LCM

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?

After $60$ minutes, at $8 \ a.m$
After $6$ hours at $1 \ p.m$
After $25$ minutes, at $7:25 \ a.m$
After $3$ hours at $10 \ a.m$

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