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Elena went on a 6-mile walk. She completed the first half of the walk 1 mi/h faster than usual and the second half of the walk 2 mi/h slower than the first half.
a. If it took her 7 .2 h to complete the walk, what is her usual rate?
b. What is the formula necessary to solve this problem?

Answers

Answered by oobleck
if her usual speed is x, then since time = distance/speed,
3/(x+1) + 3/(x-1) = 7.2
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