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word problem in Elementary Algebra

Algebra
Tutor: None Selected Time limit: 1 Day

A bus has traveled on a level road for 7 hours at an average speed 20 miles per hour than it traveled on a winding road. the time spent on the winding road was 5 hours. find the average speed on the level road if the entire trip was 656 miles

Sep 20th, 2014

Let s = av speed on the level road
then
(s-20) = av speed on the winding road
:
Write a dist equation: dist = speed * time
:

Lev Rd dist + winding Rd dist = 285 miles
3s + 2(s-20) = 285
3s + 2s - 40 = 285
5s = 285 + 40
5s = 325
s = 325/5
s = 65 mph on level roads
:
:
Check solution
3(65) + 2(65-20) =
195 + 90 = 285


Sep 20th, 2014

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