SOLUTION: Moe and Joe take a car trip. Moe drives at an average speed of 42 mph for the first hour and then they stop for gas for 10 minutes. After filling gas, Joe drives at an average spee

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Question 507597: Moe and Joe take a car trip. Moe drives at an average speed of 42 mph for the first hour and then they stop for gas for 10 minutes. After filling gas, Joe drives at an average speed of 28 mph for 40 minutes, and then the traffic clears and he gets to drive at an average speed of 60 mph for half hour. Find the average speed of the car on this trip.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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Moe and Joe take a car trip. Moe drives at an average speed of 42 mph for the first hour and then they stop for gas for 10 minutes.
After filling gas, Joe drives at an average speed of 28 mph for 40 minutes, and then the traffic clears and he gets to drive at an average speed of 60 mph for half hour.
Find the average speed of the car on this
Find the total dist:
42 * 1 = 42 mi
28*40%2F60 = 18.67 mi
60 * .5 = 30 mi
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total dist: 90.67 mi
:
Find the total time, in minutes
60 + 10 + 40 + 30 = 140 min
Convert to hrs, 140%2F60 = 2.33 hrs
:
Find the average speed
140%2F2.33 = 39.9 mph is the average speed