Question

plz solve seventh que.

Answer 1

Answer:

3 times, at every 1080 seconds, so at 1080 seconds, 2160 seconds, and 3240 seconds

Step-by-step explanation:

Use prime Factorization to find LCM

8 - 2 x 2 x 2

12 - 2 x 2 x 3

15 - 3 x 5

18 - 2 x 3 x 3

2 occurs as a prime factor 3 times, 3 occurs as a prime factor 3 times, and 5 occurs as a prime factor 1 time.

LCM = 2 x 2 x 2 x 3 x 3 x 3 x 5 = 1080