Arunner can jog at a rate of 4 miles per hour uphill. downhill, he can run 3 miles in the same time it takes him to run 2 miles uphill. how long would it take to run 2 miles uphill and then 3 miles downhill? what is the most important variable?

The most important variable is 4 miles per hour up hill. Down hill he can run 3 miles in the same time it takes time to run uphill.  up hill 4 miles  1 hour  so 2 miles up hill is 1/2 hour.  Down hill he can run 3 miles in the same time it takes time to run up hill..  2 miles up hill - 1/2 hour.  So 1/2 hr up and 1/2 hr down = 1 hour. 

Answer a. you’re welcome

The answer is 16.66 i'm pretty sure