david has two electronic beepers;one of them beeps every 4 second ,the other beeps every 9 seconds .if they are turned at exactly the same time for how many times during the next hour will both beepers beep at the same time?

Question

david has two electronic beepers;one of them beeps every 4 second ,the other beeps every 9 seconds .if they are turned at exactly the same time for how many times during the next hour will both beepers beep at the same  time?

anonymous · Answer

36 sec

anonymous · Answer

After 36 seconds both shall beep at the same time.In one hour there are 3600 seconds, So they shall beep simultaneously 100 times.