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 ?

Four runners started running simultaneously from a point on a circular

1.	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 ?
A.	1800 seconds
B.	3600 seconds
C.	2400 seconds
D.	4800 seconds
Answer» B. 3600 seconds