SOLUTION: A family takes a car trip. They travel for an hour at 90 km/h and then for two hours at 40km/h Find their average speed during the trip

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Question 358590: A family takes a car trip. They travel for an hour at 90 km/h and then for two hours at 40km/h Find their average speed during the trip
Found 2 solutions by Alan3354, Fombitz:
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Find the total distance.
Divide that by the total time.

Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Rate*Time=Distance
R%2At=D
D%5B1%5D=90%2A1=90km
D%5B2%5D=40%2A2=80km
Average speed is total distance divided by total time.
V%5Bave%5D=%2890%2B80%29%2F%281%2B2%29=170%2F3km/hr or approximately,
V%5Bave%5D=56.7km/hr