Question

six strings of violin start vibrating simultaneously and they vibrate at 3,4,5,6,10 and 12 times in a minute, find i) After how much time will all six of them vibrate together? ii) How many times will they vibrate together in 30 minutes? A) 60 sec, 31 times B)60 min, 31 times C)120 sec, 15 times D) none of these

Answer 1

34561012 lcm will be 60 it means after 60 minutes they rang togther
the option will be B

Answer 2

Answer:

the correct answer is A