SOLUTION: Karina rode her bike up a mountain trail at an average speed of 4 mph. then she rode back down the trail at an average speed of 20 mph. the entire trip took 3 hours. how far up the

Question 351959: Karina rode her bike up a mountain trail at an average speed of 4 mph. then she rode back down the trail at an average speed of 20 mph. the entire trip took 3 hours. how far up the mountain did Karina go?
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Karina rode her bike up a mountain trail at an average speed of 4 mph. then she rode back down the trail at an average speed of 20 mph. the entire trip took 3 hours. how far up the mountain did Karina go?
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t = d/r
t = d/4 + d/20 = 3
6d/20 = 3
d = 10 miles

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