SOLUTION: 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

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
---
x = distance on highway
y = distance on city streets
---
distance on highway
x = 60*312
x = 18720
---
distance on city streets
y = 30*112
y = 3360
---
total distance:
x + y = 18720 + 3360
x + y = 22080 miles
---
total time:
312 + 112 = 424 hours
---
average speed for entire trip:
s = 22080/424
s = 52.1 mph
---
Solve and graph linear equations:
https://sooeet.com/math/linear-equation-solver.php
---
Solve quadratic equations, quadratic formula:
https://sooeet.com/math/quadratic-formula-solver.php
---
Convert fractions, decimals, and percents:
https://sooeet.com/math/fraction-decimal-percent.php
---
Calculate and graph the linear regression of any data set:
https://sooeet.com/math/linear-regression.php
RELATED QUESTIONS
While driving on the highway, Dave averages 60 miles per hour. In the city, he averages... (answered by josgarithmetic,lwsshak3)

Mishka is on a long road trip, and she averages 60 mph for 2 hours while she's driving... (answered by Alan3354)

Suppose your car averages 30 miles per gallon on the highway if your average speed is 60... (answered by josmiceli)

suppose your car averages 38 miles per gallon on the highway if your averages speed is 60 (answered by Alan3354)

A man drives from his home at 30 miles per hour to the shopping center which is 20 miles... (answered by macston)

Carole's car averages 12.8 miles per gallon in city driving and 21.6 miles per gallon in... (answered by josgarithmetic)

Carlos leaves Los Angeles on a cross-country car trip at 8:00 a.m. He averages 50 miles... (answered by Alan3354)

Ahmad travels from his house to his friend's house averaging 60 miles per hour. On the... (answered by josmiceli,Alan3354)

a motorist drives from London to Liverpool. 160 miles in on highway where the motorist... (answered by ewatrrr)