Question

Three bells toll at intervals of 9, 12, 15 minutes respectively. If they start tolling
together, after what time will they next toll together? How many times will they toll
together in 20 hours excluding the one at the start?​

Answer 1

Step-by-step explanation:

this is how you could solve it

we have to find the LCM and divide by 20

Answer 2

Answer:

Step-by-step explanation

lcm of 9 12 15 gives the answer

180