To calculate the speed, we can use the formula for speed:

\[
\text{Speed} = \frac{\text{Distance}}{\text{Time}}
\]

Given:
- **Distance** = 78 meters  
- **Time** = 12 seconds  

\[
\text{Speed} = \frac{78 \, \text{meters}}{12 \, \text{seconds}} = 6.5 \, \text{m/s}
\]

### Answer:
The speed is **6.5 meters per second (m/s)**. 

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Would you like me to provide details or explore further? Here are some related questions:

1. What is the speed in kilometers per hour (km/h)?
2. How long would it take to travel 100 meters at this speed?
3. What is the acceleration if the object starts from rest?
4. What is the total distance covered if the speed is maintained for 30 seconds?
5. How can speed be converted to different units, such as feet per second?

**Tip:** Always keep an eye on unit conversions when working with speed, distance, and time.

Learn how to calculate speed using the formula Speed = Distance / Time. In this problem, an object travels 78 meters in 12 seconds, resulting in a speed of 6.5 m/s. This lesson covers fundamental physics concepts of speed, distance, and time, suitable for students in Grades 5-7.

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