Answer:
36 miles.
Step-by-step explanation:
We have been given that 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.

Substitute the given values:




The total distance is 72 miles, so the distance going up would be half of 72.

Therefore, Karina went 36 miles up the mountain.
I think answer should be b. Please give me brainlest let me know if it’s correct or not okay thanks bye
Dude this question is asking you which of these do you need help with.
So just choose all thee answers that you don't know how to do.
490=10·40+15x
490=400+15x
90=15x
x=6
he worked a total of 46 hours