Final answer:
The dog took 7.5 seconds to walk 15 meters at a speed of 2 meters per second. The formula for time (time = distance ÷ speed) was used to find the answer.
Step-by-step explanation:
To calculate how long it took the dog to walk 15 meters at a speed of 2 meters per second, we can use the formula for time which is time = distance ÷ speed. In this case, the distance the dog walks is 15 meters and the speed is 2 meters per second.
So time taken = 15 m ÷ 2 m/s = 7.5 seconds.
This calculation is straightforward and helps us understand concepts of speed, distance, and time.