To convert a speed from meters per minute (m/min) to kilometers per hour (km/hr), you can follow a systematic approach. Below is a detailed explanation of the conversion process.

Understanding Units
- **Meters to Kilometers**:
- 1 kilometer (km) = 1000 meters (m)
- **Minutes to Hours**:
- 1 hour (hr) = 60 minutes (min)

Conversion Process
1. **Convert Meters to Kilometers**:
- Since there are 1000 meters in a kilometer, you need to divide the number of meters by 1000.
2. **Convert Minutes to Hours**:
- As there are 60 minutes in an hour, you need to multiply the number of minutes by 60.

Step-by-Step Calculation
- Start with your speed: **400 m/min**.
- **Convert meters to kilometers**:
- \( \frac{400 \, \text{m}}{1000} = 0.4 \, \text{km} \)
- **Convert minutes to hours**:
- \( 0.4 \, \text{km/min} \times 60 \, \text{min/hr} = 24 \, \text{km/hr} \)

Final Result
- Therefore, **400 m/min** is equivalent to **24 km/hr**.
This conversion is useful in various practical applications, such as calculating speeds in sports, transportation, and daily life scenarios. Understanding these conversions will help you in solving similar problems in the future.