X, Y and Z start at the same time in the same direction to run around a circular stadium. X completes a round in 300 seconds, Y in 600 seconds and Z in 900 seconds, all starting at the same point. After what time will they again at the starting point ?
26 minutes and 18 seconds
46 minutes and 12 seconds
L.C.M. of 300,600 and 900 = 1800.
So, X, Y and Z will again meet at the starting point in 1800 sec. i.e., 30 min.
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