Starting at home, Tiffany traveled uphill to the toy store for
24 minutes at just 15 mph. She then traveled back home along the same path downhill at a speed of 30 mph.
What is her average speed for the entire trip from home to the toy store and back?
The average speed is not just the average of
15 mph and 30 mph.
She traveled for a longer time uphill (since she was going slower), so we can estimate that the average speed is closer to
15mph than 30 mph.
To calculate the average speed, we need to make use of the following:
average speed= total distance / total time
The rest of it is not too difficult. Can check the video to see how it is done for a similar problem.
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