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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