Question

Two bells ring together. If the bells ring at every 3 minutes and 4 minutes respectively,
at what interval of time, will they ring together again?​

Answer 1

Answer:

12 minutes

Step-by-step explanation:

1st bell rings every 3 minutes and second rings every 4 minutes

if they are to ring together it should be at a time common for both 3 and 4 which is 12

this is the correct answer.

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Answer 2

Given,

The first bell rings every time$\[ = 3\min \]$

The second bell rings every time$\[ = 4\min \]$

Solution,

Know that the bell shall ring together according to their LCM.

Therefore,

$\[\begin{array}{l} \Rightarrow 3 \times 4\\ \Rightarrow 12\end{array}\]$

Hence, after$\[12\min \]$ the bells shall ring together.