Question

There are 3 bells. Bells A tolls for 1s after every 4s. Bell B tolls for 1s after every 5s. Bell C tolls for 1s after every 8s. All of them tolled together. How much time after this would they toll together again?​
a) 40s b)180s c)90s d)89s

Answer 1

Step-by-step explanation:

Here we have to find LCM of 4, 5 & 8.

LCM of 4,5 & 8 is 40

All the values are given in seconds.

Hence the value of LCM is also in seconds.

Therefore, correct answer is 40 second i.e. option (a)