SOLUTION: Mary can 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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Question 1193023: Mary can 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 ?
Found 2 solutions by josgarithmetic, Alan3354:
Answer by josgarithmetic(39615)   (Show Source): You can put this solution on YOUR website!
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Mary can 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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            SPEEDS         TIMES           DISTANCE

UPHILL          r           d/r               d

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

DIFFERENCE                 1.2

Some information is missing from the description.
Answer by Alan3354(69443)   (Show Source): You can put this solution on YOUR website!
Mary can 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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d = r*t --- downhill
d = (r-6)*(t + 1.2) ---- uphill
===================
rt = rt + 1.2r - 6t - 7.2
1.2r - 6t = 7.2
Not enough info.
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