Concept explainers
To find the average speed for the last third of the trip of Maria.
Answer to Problem 18P
The average speed of the last 80% of her trip was
Explanation of Solution
Formula:
Given that the averaged
Formula:
Let total distance be x and remaining 80% speed be
First, determine the total time 20% distance covered with speed
Now, determine the total time of remaining 80% distance covered with speed
Finally determine the time for total distance travelled be x with the speed of
Now, Add equation ( i ) and equation ( ii ) and compare with equation (iii)
Hence, The average speed of the last third of the trip is
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