Shelly wants to find the speed that her dog can run. What should Shelly do?

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1 point
measure the time the dog runs
measure the distance the dog runs
measure the size of the dog and the distance it runs
measure the time it takes for the dog to run a certain distance

Shelly should measure the time the dog runs and the distance the dog runs. By dividing the distance by the time, she can calculate the speed at which her dog can run.