Question 930410: While driving on the highway Fiona averages 60 miles per hour. In the city she averages 30 miles per hour. On a trip to her grandmother's house Fiona drove 312 hours on the highway and 112 hours in the city.
What was Fiona's average speed for the entire trip?
Answer by TimothyLamb(4379)   (Show Source):
You can put this solution on YOUR website! s = d/t
d = st
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x = distance on highway
y = distance on city streets
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distance on highway
x = 60*312
x = 18720
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distance on city streets
y = 30*112
y = 3360
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total distance:
x + y = 18720 + 3360
x + y = 22080 miles
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total time:
312 + 112 = 424 hours
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average speed for entire trip:
s = 22080/424
s = 52.1 mph
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