A speed of 22.5 m/sec is the same as

Options

A. 40.5km/hr
B. 81 km/hr
C. 36.8km/hr
D. 72km/hr

Answer

To convert a speed from meters per second (m/s) to kilometers per hour (km/h), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Conversion Factors**:
- 1 meter = 1/1000 kilometers
- 1 second = 1/3600 hours

2. **Set Up the Conversion**:
- To convert from m/s to km/h, we can use the formula:
\[ \text{Speed in km/h} = \text{Speed in m/s} \times \left(\frac{3600 \text{ seconds}}{1 \text{ hour}}\right) \times \left(\frac{1 \text{ km}}{1000 \text{ m}}\right) \]

3. **Substitute the Given Speed**:
- Substitute 22.5 m/s into the formula:
\[ \text{Speed in km/h} = 22.5 \times \left(\frac{3600}{1}\right) \times \left(\frac{1}{1000}\right) \]

4. **Calculate the Conversion**:
- First, calculate \( \frac{3600}{1000} \):
\[ \frac{3600}{1000} = 3.6 \]
- Now multiply by 22.5:
\[ \text{Speed in km/h} = 22.5 \times 3.6 \]

5. **Perform the Multiplication**:
- Calculate \( 22.5 \times 3.6 \):
\[ 22.5 \times 3.6 = 81 \]

6. **Final Result**:
- Therefore, 22.5 m/s is equal to 81 km/h.

### Final Answer:
The speed of 22.5 m/sec is the same as **81 km/h**.

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