SOLUTION: I need help! A person travels 15 miles in 1/3 of an hour, then returns by traveling that same 15 miles in 1/7 of an hour. What is that person's average rate for the trip?

Question 529505: I need help!
A person travels 15 miles in 1/3 of an hour, then returns by traveling that same 15 miles in 1/7 of an hour. What is that person's average rate for the trip?

thank you
Found 2 solutions by ankor@dixie-net.com, MathTherapy:
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
A person travels 15 miles in 1/3 of an hour, then returns by traveling that same 15 miles in 1/7 of an hour.
What is that person's average rate for the trip?
:
Let a = the average speed of the 30 mi trip
:
Write a time equation, time = dist/speed
+ =
invert the dividing fraction and multiply
3(15) + 7(15) =
45 + 105 =
150 =
Multiply both sides by a
150a = 30
divide both sides by 150
a =
a = mph hr is the average speed
Answer by MathTherapy(10555) (Show Source): You can put this solution on YOUR website!
I need help!
A person travels 15 miles in 1/3 of an hour, then returns by traveling that same 15 miles in 1/7 of an hour. What is that person's average rate for the trip?

Average rate = total distance, divided by total time

We then have:

, or , or mph

Send comments and �thank-yous� to �D� at MathMadEzy@aol.com
RELATED QUESTIONS
a person biking uphill travels 15 miles in an hour. The same person biking downhill... (answered by Alan3354)
David and Andrew are traveling to a Mathematics conference. David travels 110 miles in... (answered by Alan3354,greenestamps,josgarithmetic)
Train A has a speed 15 miles per hour greater than that of train B. If train A travels... (answered by rothauserc)
John and Peter are traveling to a science conference. John travels 110 miles in the same... (answered by josgarithmetic)
I hope you can help A car travels 180 miles. A second car, traveling 15 m/h faster than... (answered by solver91311)
A person drives a car at a constant speed for 4 hours an 15 minutes, traveling 272 miles. (answered by jorel1380)
please help 1.maria travels upstream by boat a distance of 60 miles in 15 hours. the... (answered by mananth)
A car traveling 50 miles per hour goes 15 miles farther in the same amount of time as a... (answered by mananth)
1 car travels 15 miles an hour the 2nd car travels 30 miles an hour. The first car... (answered by josmiceli)