Question

Three bells ring at intervals of 12 15 and 18 seconds respectively if they start drinking together at 8:35 then but they together will again drink

Answer 1

LCM of 12,15,18 is 180

12=2×2×3

15=3×5

18=3×3×2

LCM =2×2×3×3×5=180

so 180 seconds = 3min

so the bell again ring at 8:38