SOLUTION: annie and marie hiked up an 18-mile mountain trail at 5 mph. They immediately hiked down at 4 mph. How long did the hike take? *Please help me with this math question!!

Algebra ->  Rate-of-work-word-problems -> SOLUTION: annie and marie hiked up an 18-mile mountain trail at 5 mph. They immediately hiked down at 4 mph. How long did the hike take? *Please help me with this math question!!      Log On


   

Question 135445: annie and marie hiked up an 18-mile mountain trail at 5 mph. They immediately hiked down at 4 mph. How long did the hike take?
*Please help me with this math question!!
Answer by smarty1994(10) About Me  (Show Source):
You can put this solution on YOUR website!
First, you'd make a D=RT chart.

The first part would be the distance going up (18=5T)
Next would be the distance going down (18=4T)

Time going uphill=3.6 hours
Time Going downhill=4.5 hours

Final answer= 8.1 hrs