Question

the bells toll at intervals 9,12,15 minutes respectively if they start tolling together after what time they will the next toll together

Answer 1

the bell toll at the interval of 9, 12, 15 min

prime factor are :
9 = 3 x 3
12 = 2 x 2 x 3
15 = 3 x 5

its LCM is 3 x 2 x 2 x 5 x 3 = 180

the bell will toll after 180min or 3 hours

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Answer 2

Answer:

3 hours later

Step-by-step explanation:

We need to find LCM

9 = 3 x 3

12 = 2 x 2 x 3

15 = 3 x 5

LCM = 2 x 2 x 3 x 3 x 5

LCM of 9, 12 and 15 is 180

180 mins = 3 hours

So, they will start tolling/ringing after 3 hours

Hope it helps

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