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Four runners started running simultaneously from a point on a circular track. They took 200 seconds, 300 seconds, 360 seconds and 450 seconds to complete one round. After how much time do they meet at the starting point for the first time ?
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- 1800 seconds
- 3600 seconds
- 2400 seconds
- 4800 seconds
Correct Option: A
Required time = LCM of 200, 300, 360 and 450 seconds
We find , LCM of 200, 300, 360 and 450 seconds = 1800 seconds
∴ Required time = 1800 seconds
