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thinkies

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**[SOLVED] *System of equations AND Inequation* (Need help)...**

## Homework Statement

Alex is a professionel athlete. One day, he leaves for mountain hiking and ascends a coast to an average speed of 12 km/hour. On his way back, he borrows the same coast and descends to an average speed of 18 km/hour. The descent lasted 15 minutes less than the ascension.

Find the coast length.

P.S.: *Sorry for the typo, I had to translate this problem from french to english =.=...

## Homework Equations

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## The Attempt at a Solution

Where do I even start with this...

This problem may be easy for some of you...well its a typical 9th grade question...

(P.S.: I did attempt something..however I am not sure.Waiting for your answers/tips/advices...)

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