Question

a bell rings at every 6 seconds. a second bell rings at every 8 seconds. a third bell rings at every 10 seconds. if all the three bells ring at the same time at 9o clock in the morning, at what time will they all ring together again

Answer 1

Lcm of 6,8,10 is 120 sec. = 2min
So they ring together after 2 min i.e. at 9:02

Answer 2

Answer:

At 9:00:02 AM will they all ring together again.

Step-by-step explanation:

Given : A bell rings at every 6 seconds. a second bell rings at every 8 seconds. a third bell rings at every 10 seconds. If all the three bells ring at the same time at 9'o clock in the morning.

To find : At what time will they all ring together again?

Solution :

First we find the LCM of bell rings i.e. 6,8,10

$6=2\times 3$

$8=2\times 2\times 2$

$10=2\times 5$

$LCM(6,8,10)=2$

Which means after 2 seconds bell rings.

i.e. At 9:00:02 AM will they all ring together again.