SOLUTION: Karina rode her bike up a mountain trail at an average of 4 mph. Then she rode it back down the trail at an average of 20 mph. The entire trip took 3 hours. How far up the mountain
Algebra ->
Customizable Word Problem Solvers
-> Travel
-> SOLUTION: Karina rode her bike up a mountain trail at an average of 4 mph. Then she rode it back down the trail at an average of 20 mph. The entire trip took 3 hours. How far up the mountain
Log On
Question 938225: Karina rode her bike up a mountain trail at an average of 4 mph. Then she rode it back down the trail at an average 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 of 4 mph. Then she rode it back down the trail at an average of 20 mph. The entire trip took 3 hours. How far up the mountain did karina go?
-------------
Avg speed of the round trip = 2*4*20/(4+20) = 20/3 mi/hr
RT distance = r*t = (20/3)*3 = 20 miles
--> 10 miles each way
