Question

3 bells toll at intervals of 9 12 15 minutes respectively if they start tolling together after what time will they next toll together. Solve this by arithmetic progression

Answer 1

Answer:

If the sum is time related then we should find LCM

 LCM of 9,12,15=180

         hence the answer is after 180 mins they toll together.

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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