1957 AHSME Problems/Problem 20
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 .
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 .
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