Question

Three different alarms go off air at an interval of 9 minutes, 12 minutes and 15 minutes respectively. If they are started together at 09:30 a.m., after what time will the alarms go off together?

Answer 1

Answer:

So easy

Step-by-step explanation:

What we wil do .

First we have to take the HCF of the no. 9 , 12, 15

HCF will be 3

Now we will add the 3 to the time

9:30 +3 = 12:30 pm

At 12:30 the alarm will go off together.