The average speed is 70 kilometers per hour.
Average speed is defined as the ratio of the total distance traveled by a body to the total time taken for the body to reach its destination.
Given that your grandmother's home is 210 kilometers away, and it takes you 3 hours to get there.
To determine the average speed
Here, we have the total distance traveled by a body = 210 kilometers
And the total time taken for the body to reach its destination = 3 hours
So, the average speed = distance / time
The average speed = 210/3
The average speed = 70 kilometers per hour
Hence, the average speed is 70 kilometers per hour.
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