Question 1193023
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Mary can {{{cross(x-country)}}} ski down a hill 6 km / hour faster than she can ski up the hill. If it takes her 1.2 hours longer to ski up the hill, what is her speed going up ?
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<pre>
            SPEEDS         TIMES           DISTANCE

UPHILL          r           d/r               d

DOWNHL         r-6          d/(r-6)           d

DIFFERENCE                 1.2
</pre>
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