SOLUTION: here's another one: a bus traveled on a level road for 3 hours at an average speed 20 miles per hour faster than it traveled on a winding road. the time spend on the winding roa

Algebra ->  Coordinate Systems and Linear Equations -> SOLUTION: here's another one: a bus traveled on a level road for 3 hours at an average speed 20 miles per hour faster than it traveled on a winding road. the time spend on the winding roa      Log On


   



Question 157597: here's another one:
a bus traveled on a level road for 3 hours at an average speed 20 miles per hour faster than it traveled on a winding road. the time spend on the winding road was 4 hours. find the average speed on the level road if the entire trip was 305 miles.

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
for the level road,
t+=+3hrs
Let average speed = s+%2B+20
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For the winding road,
t+=+4hrs
Let average speed = s
3%2A%28s+%2B+20%29+%2B+4s+=+305
3s+%2B+60+%2B+4s+=+305
7s+=+245
s+=+35
s+%2B+20+=+55mi/hr
The average speed on the level road is 55 mi/hr