A train is running with the speed of 45 km/hr what is its speed in metre per second

Options

A. 12.5
B. 13.5
C. 20.5
D. none of these

Answer

To convert the speed of the train from kilometers per hour (km/hr) to meters per second (m/s), we can use the conversion factor. The formula for this conversion is:

\[ \text{Speed in m/s} = \text{Speed in km/hr} \times \frac{5}{18} \]

### Step-by-Step Solution:

1. **Identify the speed in km/hr**:
The speed of the train is given as 45 km/hr.

2. **Use the conversion factor**:
To convert km/hr to m/s, we multiply by \( \frac{5}{18} \).

\[ \text{Speed in m/s} = 45 \times \frac{5}{18} \]

3. **Calculate the multiplication**:
First, calculate \( 45 \times 5 \):

\[ 45 \times 5 = 225 \]

4. **Divide by 18**:
Now, divide 225 by 18:

\[ \frac{225}{18} = 12.5 \]

5. **Final result**:
Therefore, the speed of the train in meters per second is:

\[ \text{Speed} = 12.5 \, \text{m/s} \]

### Conclusion:
The correct answer is \( 12.5 \, \text{m/s} \).