Question

What is it with the name Sara these days!? XD

Answer 1

66 mph

Explanation:

Average speed is the rate of change of distance with time:

       Average speed = $\frac{Distance }{time}$

Given parameters:

Starting point = 88mile marker

End of journey = 121mile marker

time = 30minutes = 0.5hr(60min = 1hr)

Solution:

The distance covered in this journey:

  Distance = End of journey - starting point = 121 mile - 88 mile = 33mile

 Average speed = $\frac{33miles}{0.5hr}$

                            = 66mph

The average speed of Sara's mum is 66mph

Learn more:

Average speed brainly.com/question/8893949

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