Q26. There are five bells which start ringing together at intervals of 3, 6, 9, 12 and 15 seconds respectively. In 39 minutes, how many times will the bell ring simultaneously?

Q. Three bells ring at intervals of 2 minutes, 3 minutes and 4 minutes respectively. After how much time will the bells ring altogether?

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Choose the correct answer from the alternatives given :Four bells ring at the intervals of 5, 6, 8 and 9 seconds. All the bells ring simultaneously at some time. They will again ring simultaneously after

The correct option is A 6 minutesThe LCM of 5,6,8 and 9 = 360 sec = 6 minutes.

Choose the correct answer from the alternatives given :
Four bells ring at the intervals of 5, 6, 8 and 9 seconds. All the bells ring simultaneously at some time. They will again ring simultaneously after

The correct option is A $6$ minutes
The LCM of $5, 6, 8 a n d 9$ = $360$ sec = $6$ minutes.