Convert each of the following speeds in to km /hr :
35m/sec

Answer

To convert the speed from meters per second (m/sec) to kilometers per hour (km/hr), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Conversion Factors**:
- We know that 1 kilometer (km) is equal to 1000 meters (m).
- We also know that 1 hour (hr) is equal to 3600 seconds (sec).

2. **Set Up the Conversion**:
- We need to convert 35 m/sec into km/hr.
- We can use the conversion factors to do this.

3. **Convert Meters to Kilometers**:
- Since 1 meter is equal to \( \frac{1}{1000} \) kilometers, we can express 35 meters as:
\[ 35 \, \text{m} = 35 \times \frac{1}{1000} \, \text{km} = \frac{35}{1000} \, \text{km} \]

4. **Convert Seconds to Hours**:
- Since 1 second is equal to \( \frac{1}{3600} \) hours, we can express 1 second in terms of hours:
\[ 1 \, \text{sec} = \frac{1}{3600} \, \text{hr} \]

5. **Combine the Conversions**:
- To convert from m/sec to km/hr, we multiply the speed in km by the number of seconds in an hour:
\[ \text{Speed in km/hr} = \left( \frac{35}{1000} \, \text{km} \right) \times 3600 \, \text{sec/hr} \]

6. **Calculate the Result**:
- Now, we can simplify the calculation:
\[ \text{Speed in km/hr} = \frac{35 \times 3600}{1000} \]
- Calculate \( 35 \times 3600 = 126000 \).
- Now divide by 1000:
\[ \text{Speed in km/hr} = \frac{126000}{1000} = 126 \, \text{km/hr} \]

### Final Answer:
The speed of 35 m/sec is equal to **126 km/hr**.

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