SOLUTION: The total traveling time if the Smiths drove y km at 60 km/h and on the return trip improved their average speed to 80 0 km/h . What is it simplest form

Algebra ->  Customizable Word Problem Solvers  -> Travel -> SOLUTION: The total traveling time if the Smiths drove y km at 60 km/h and on the return trip improved their average speed to 80 0 km/h . What is it simplest form       Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 1166067: The total traveling time if the Smiths drove y km at 60 km/h and on the return trip improved their average speed to 80 0 km/h . What is it simplest form
Found 2 solutions by Alan3354, josgarithmetic:
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
The total traveling time if the Smiths drove y km at 60 km/h and on the return trip improved their average speed to 80 0 km/h . What is it simplest form
----------------
average speed to 80 0 km/h ???
If the return speed is 80 km/hr:
----------
The average speed = 2*60*80/(60+80) = 480/7 km/hr (regardless of the distance)
d = r*t
y = (480/7)*t kms --- t in hours (if y is the round-trip distance)

Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
y for both distances, because "return trip".
Assuming "improved" meant to be "increased".
Return trip, speed was INCREASED TO,... 
                      SPEED       TIME         DISTANCE

first part             60                       y

second part            80                       y

totals


Use system%28RT=D%2CD%2FT=R%2CD%2FR=T%29.

Find expression for the total traveling time:
                      SPEED       TIME         DISTANCE

first part             60         y/60            y

second part            80         y/80            y

totals                       highlight%28y%2F60%2By%2F80%29