1957 AHSME Problems/Problem 20
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Problem
A man makes a trip by automobile at an average speed of 50 mph. He returns over the same route at an average speed of mph. His average speed for the entire trip is:
Solution
Suppose the first half of the trip's distance is called . Then the time for the first half is and the second half's time is , so the total time is , so the speed is , so the answer is .
See Also
1957 AHSC (Problems • Answer Key • Resources) | ||
Preceded by Problem 19 |
Followed by Problem 21 | |
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