X, Y, Z start at the same time in the same direction to run around a circular stadium. X completes a round in 63 seconds, Y in 105 seconds and Z in 210 seconds. If they start at the same time, then at what time will they meet again at the starting point?
X = 63
Y = 105
Z = 210
LCM of X,Y & Z = 630 Seconds or 10 min & 30 seconds