Change a speed of 12 m/sec into km/hr.

Answer

To convert a speed of 12 m/sec into km/hr, follow these steps:

### Step-by-Step Solution:

1. **Understand the Conversion Factor**:
To convert meters per second (m/sec) to kilometers per hour (km/hr), we use the conversion factor:
\[ 1 \text{ m/sec} = \frac{18}{5} \text{ km/hr} \]

2. **Set Up the Calculation**:
We need to convert 12 m/sec into km/hr. We can do this by multiplying the speed in m/sec by the conversion factor:
\[ \text{Speed in km/hr} = \text{Speed in m/sec} \times \frac{18}{5} \]

3. **Perform the Multiplication**:
Substitute 12 for the speed in m/sec:
\[ \text{Speed in km/hr} = 12 \times \frac{18}{5} \]

4. **Calculate the Multiplication**:
First, calculate \(12 \times 18\):
\[ 12 \times 18 = 216 \]
Now, divide by 5:
\[ \frac{216}{5} = 43.2 \]

5. **Final Result**:
Therefore, the speed of 12 m/sec is equal to:
\[ 43.2 \text{ km/hr} \]

### Summary:
The speed of 12 m/sec is equivalent to 43.2 km/hr.

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