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algebra1

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Alan went from San Francisco to Los Angeles ,about 400 miles,averaging (x+5)mph.On his journey from Los Angeles to Redding,about 500 miles,the average (x-5)mph.Then he returned to San Francisco,about 200 miles,averaging (x^2-25)mph.How long did it take him,in terms of x,to make the round trip?

  • algebra1 -

    distance = rate times time.

    Use the formula and plug in the constants and variables.

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