SOLUTION: Riding mostly downhill, Joan rode her ten-speed bicycle to the state fair in 1.5 h. It took 4.2 h to make the return trip, since her average speed was 36 km/h less than her average

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Question 1089353: Riding mostly downhill, Joan rode her ten-speed bicycle to the state fair in 1.5 h. It took 4.2 h to make the return trip, since her average speed was 36 km/h less than her average speed on the way tot he fair. Find her average speed in each direction.
Answer by josgarithmetic(39625) About Me  (Show Source):
You can put this solution on YOUR website!
             SPEED       TIME      DISTANCE
DOWNHL        r          1.5        d
UPHILL       r-36        4.2        d

1.5r=4.2%28r-36%29
-
15r=42%28r-36%29
5r=14%28r-36%29
5r=14r-14%2A36
9r=14%2A36
highlight%28r=56%29----downhill
highlight%2820%29-----uphill