Determining a constant speed based on previous and average speed
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A motorist makes a trip of 180 miles. For the first 90 miles, she drives at a constant speed of
30 mph. At what constant speed must she drive the remaining distance, if her average speed for
the total trip is to be 40 mph?
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Solution Summary
This solution explains how to determine a constant speed based on previous and average speeds.
Solution Preview
The average speed for the whole trip is simply given by:
Va = DISTANCE TRAVELED/TIME TAKEN = D/T
Va = average speed, D = distance traveled (total), T = total time traveled.
It is easy to think that
Va = (v1+v2)/2, but this is incorrect, use the formula above. From the problem we can ...
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