SOLUTION: a car covers one -quarter of distance to the next town at 40km/hr,another quater at 50km/hr,and the rest at 90km/hr,find the car's average speed for the entire distance

Question 490168: a car covers one -quarter of distance to the next town at 40km/hr,another quater at 50km/hr,and the rest at 90km/hr,find the car's average speed for the entire distance
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
For average speed, always use (total distance) / (total time)
Let the entire distance = km
car's time for 1st

hrs
car's time for 2nd

hrs
car's time for last

hrs
average speed =
Divide top and bottom by
average speed =
Multiply top and bottom by
average speed =
Multiply top and bottom by
average speed =
average speed = km/hr
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