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what is the average speed of 40 mph , 50 mph, and 55 mph

Need help on this for 8th grade math

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Kemal G. | Patient and Knowledgeable Math and Science Tutor with PhDPatient and Knowledgeable Math and Scien...
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Hi Danny,
 
Average is described as the sum of certain quantities divided by their count. So, in this case the average of the given speeds would be
avg = (40 + 50 + 55) / 3
= 145 / 3
= 48.3 (decimal 3 recurring, should be indicated by a bar above it but I don't know how to do it on this platform)