Question

4 bells ring at an interval of 15,20,30,12 sec then in 6 hrs how much time they ring together

Answer 1

SOLUTION

GIVEN

4 bells ring at an interval of 15 , 20 , 30 , 12 sec

TO DETERMINE

In 6 hrs how many time they ring together

EVALUATION

Here it is given that 4 bells ring at an interval of 15 , 20 , 30 , 12 sec

15 = 3 × 5

20 = 2 × 2 × 5

30 = 2 × 3 × 5

12 = 2 × 2 × 3

LCM of 15 , 20 , 30 , 12

= 2 × 2 × 3 × 5

= 60

60 sec = 1 minute

So after each 1 minutes they will ring together

Now 6 hour = 360 minutes

Hence the required time they ring together in 6 hours

= 360 + 1

= 361

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