Question

Three persons A, B and C can complete one round of circular track in 8, 15 and 20 minutes respectively. If they start together at 8 A.M( time) from a certain point, at what time will they be together again at the starting point ?

Answer 1

Prime factors of these three

8 = 2×2×2

15= 3×5

20= 2×2×5

LCM = 2×2×2×3×5

= 120 min

so they will meet on 10.00 am