Five bells begins to toll together and toll respectively at intervals 6,7,8,9 and 12 seconds. How many times will they toll together in one hour, excluding the one at the start?

Explanation

To solve the problem of how many times the five bells toll together in one hour, we need to follow these steps:

### Step 1: Identify the tolling intervals
The bells toll at intervals of 6, 7, 8, 9, and 12 seconds.

### Step 2: Calculate the Least Common Multiple (LCM)
To find out when all the bells will toll together, we need to calculate the LCM of the intervals.

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