SOLUTION: The car drives 35mph for 35 miles, then 50mph for 100miles, and 53mph for 53miles. What is the car average speed for the whole trip? Thank you

Algebra ->  Average -> SOLUTION: The car drives 35mph for 35 miles, then 50mph for 100miles, and 53mph for 53miles. What is the car average speed for the whole trip? Thank you      Log On


   

Question 242483: The car drives 35mph for 35 miles, then 50mph for 100miles, and 53mph for 53miles. What is the car average speed for the whole trip?

Thank you
Found 2 solutions by ankor@dixie-net.com, stanbon:
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
The car drives 35mph for 35 miles, then 50mph for 100miles, and 53mph for 53miles.
What is the car average speed for the whole trip?
:
Find the total miles driven
35 + 100 + 53 = 188 miles
:
Find the total time (time = dist/speed)
35%2F35 + 100%2F50 + 53%2F53 =
1 + 2 + 1 = 4 hrs
:
188%2F4 = 47 mph is the average speed

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
The car drives 35mph for 35 miles, then 50mph for 100miles, and 53mph for 53miles. What is the car average speed for the whole trip?
-------------------------------------------------------------
Average speed = (total distance)/(total time)
-------------------------------------------------------------
35 mph for 35 miles takes 1 hr.
----------------
50 mph for 100 miles takes 2 hr.
----------------
53 mph for 53 miles takes 1 hr.
=====================================
Average speed = (35+100+53)/(1+2+1) = 188/4 = 47 mph
=====================================
Cheers,
Stan H.