Question

Three bells start toll at intervals of 9,12 and 15 minutes if they start tolling together at 4p.m, after what time they next toll together

Answer 1

The Intervals between the tolls are 9,12,15 mins.

First time they toll together at 4p.m.

The time after which they toll together = LCM of (9,12,15)

The time after which they toll together = 180 min

The time after which they toll together = 3hours

So , they will toll together again at (4+3=7) 7p.m.

Hope this will help you .

Answer 2

Answer:

3 hours later or at 7 pm

Step-by-step explanation:

We need to find LCM

LCM of 9, 12 and 15 is 180

180 mins = 3 hours

So, they will start tolling/ringing after 3 hours

The time will be --> 4 + 3 = 7 hours

Hope it helps

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