SOLUTION: A car travels for 3 hours at a speed of 55 miles per hour and then for the next 2 hours travels at a speed of 65 miles per hour. Find the average speed of the car for the entire jo

Algebra ->  Customizable Word Problem Solvers  -> Mixtures -> SOLUTION: A car travels for 3 hours at a speed of 55 miles per hour and then for the next 2 hours travels at a speed of 65 miles per hour. Find the average speed of the car for the entire jo      Log On

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Question 1143585: A car travels for 3 hours at a speed of 55 miles per hour and then for the next 2 hours travels at a speed of 65 miles per hour. Find the average speed of the car for the entire journey.
Answer by ikleyn(52790) About Me  (Show Source):
You can put this solution on YOUR website!
.

The average speed for the entire journey is  Total_distance%2FTotal_time.


Total distance = 3*55 + 2*65 = 295 miles.


Total time = 3 + 2 = 5 hours.


You are now in position to answer the question:


    the average speed for the entire journey is  295%2F5 = 59 miles per hour.



Or simply  %283%2A55+%2B+2%2A65%29%2F%283%2B5%29 = 59 mph,  if you want the solution in one line.