algebra
posted by Anonymous .
Her average rate traveling uphill was 1.8 kilometers per hour and her average rate down hill was 4.2 kilometers per hour. If she spent a total of 16 hours hiking, how long was the trail?

add up the times to hike d km:
d/1.8 + d/4.2 = 16
0.5555d + .2381d = 16
d = 16/.7936 = 20.16 km
Respond to this Question
Similar Questions

math
Edna and Nancy leave the house of a common friend at the same time and walk for 4 hours. Edna walks due east at the average rate of 4 kilometers per hour and Nancy walks due north at the average rate of 3 kilometers per hour. What … 
ALGEBRA
If traveling at r kilometers per hour for t hours, a driver will travel rt kilometers. How far will Danny travel in 4 hours at a speed of 99 kilometers per hour? 
math
Andrea made a car trip of 440 Kilometers. She averaged 54 Kilometers per hour for the frst part of the trip and 80 kilometers per hour for the secound part. If the total trip took 6 hours, how long was she traveling at 80 kilometers … 
MATH
Andrea made a car trip of 440 Kilometers. She averaged 54 Kilometers per hour for the frst part of the trip and 80 kilometers per hour for the secound part. If the total trip took 6 hours, how long was she traveling at 80 kilometers … 
Math
How long did it take the trip if Jay drove 340 kilometers at the average rate of 68 kilometers per hour? 
Algebra
How would you set up problem: your average rate traveling uphill was 2.2 kilometers per hour and average rate downhill was 3.3 kilometers per hour. If he spent a total of 12 hours hiking, how long was the trail? 
Math
A woman rides her bicycle from her house to and from a lake. It takes her 1 1/2 hours to ride to the lake and 1 3/4 hours to ride back. She rides downhill at 12 kilometers per hour, on level ground at 8 kilometers per hour, and uphill … 
Math
A car is traveling at a rate of 35 meters per second. What is the car's rate in kilometers per hour? 
Algebra
A cyclist rides her bike at a rate of 8 meters per second. What is this rate in kilometers per hour? 
Algebra
A car is traveling at a rate of 60 miles per hour. What is the car's rate in kilometers per hour?