2020 AMC 8 Problems/Problem 11
Contents
[hide]Problem
After school, Maya and Naomi headed to the beach, miles away. Maya decided to bike while Naomi took a bus. The graph below shows their journeys, indicating the time and distance traveled. What was the difference, in miles per hour, between Naomi's and Maya's average speeds?
Solution 1
Naomi travels miles in a time of minutes, which is equivalent to of an hour. Since , her speed is mph. By a similar calculation, Maya's speed is mph, so the answer is .
Solution 2 (variant of Solution 1)
Naomi's speed of miles in minutes is equivalent to miles per hour, while Maya's speed of miles in minutes (i.e. half an hour) is equivalent to miles per hour. The difference is consequently .
Video Solution
https://youtu.be/SPNobOd4t1c (Channel also has resources to prepare for your AIME qualification)
See also
2020 AMC 8 (Problems • Answer Key • Resources) | ||
Preceded by Problem 10 |
Followed by Problem 12 | |
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All AJHSME/AMC 8 Problems and Solutions |
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