Question

Three alarm clocks ring the alarm at 3,6 and 9
minutes respectively. In one hour how many
times will the clocks ring together?
(a) 1 time
(b) 2 times (c) 3 times (d) 4 times​

Answer 1

Answer:

3 times

Because LCM of 3, 6,9 is 18

so 18/60 (1 HR=60 min)

3 times