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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