SOLUTION: Jenny walks 5 kilometers from her house to Star SuperMall to buy a new bike which she uses to return home. She averaged 10 kilometers faster on her bike than on foot. If her to

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Question 1042314: Jenny walks 5 kilometers from
her house to Star SuperMall to buy a new bike
which she uses to return home. She averaged 10
kilometers faster on her bike than on foot. If her
total trip took 1 hour and 20 minutes, what is her
walking speed in kph? Use the formula v = d/t .
Explain Briefly
Answer by josgarithmetic(39625) About Me  (Show Source):
You can put this solution on YOUR website!
           RATE      TIME           DISTANCE
WALK        r         t               5
RIDE       r+10       t-1%261%2F3         5
TOTAL                 1%261%2F3


system%28rt=5%2C%28r%2B10%29%28t-1%261%2F3%29=5%29



ALTERNATIVE ATTEMPT AT ARRANGING DATA
            RATE       TIME        DISTANCE
WALK         r          x           5
RIDE        r+10        y           5
TOTAL                1%261%2F3


From which you can modify to 
-
            RATE       TIME        DISTANCE
WALK         r          5%2Fr           5
RIDE        r+10        5%2F%28r%2B10%29           5
TOTAL                1%261%2F3

And this allows time sum equation 5%2Fr%2B5%2F%28r%2B10%29=1%261%2F3


You can decide which way is best or easier, and then solve.