Question

Three clocks ring once at the same time. After that the first clocks ring after every 90minute second after 30minutes & the third after 60minutes. After how many minutes will they ring all together?

Answer 1

Take the LCM(90,30,60) = 180

All three will ring after 180 mins or 3 hrs

Answer 2

Answer:

Take the LCM(90,30,60) = 180

All three will ring after 180 mins or 3 hrs

Step-by-step explanation: