SOLUTION: 8.) Kelsey drove an average of 50MPH for a 6-hour trip. During the first 4 hours, he drove 47MPH, what was the average speed, in MPH for last 2 hours? A.) 50 B.) 56 C.) 60 D.)

Algebra ->  Customizable Word Problem Solvers  -> Travel -> SOLUTION: 8.) Kelsey drove an average of 50MPH for a 6-hour trip. During the first 4 hours, he drove 47MPH, what was the average speed, in MPH for last 2 hours? A.) 50 B.) 56 C.) 60 D.)      Log On

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Question 748063: 8.) Kelsey drove an average of 50MPH for a 6-hour trip. During the first 4 hours, he drove 47MPH, what was the average speed, in MPH for last 2 hours?
A.) 50
B.) 56
C.) 60
D.)66
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
Kelsey drove an average of 50MPH for a 6-hour trip. During the first 4 hours, he drove 47MPH, what was the average speed, in MPH for last 2 hours?
***
ave speed=distance/travel time
total distance for the entire 6-hr trip=6*50=300 mi
distance traveled during first 4 hours=4*47=188 mi
distance traveled during last 2 hrs=300-188=112 mi
ave speed for last 2 hours=112/2=56 mph (ans. B.)