SOLUTION: A car travel for a total of 14 hours. The car averages 70 miles per hour for y hours and averages 55 miles per hour for the rest of the time. Express the total distance traveled by

Question 946347: A car travel for a total of 14 hours. The car averages 70 miles per hour for y hours and averages 55 miles per hour for the rest of the time. Express the total distance traveled by the car in terms of y.
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
A car travel for a total of 14 hours.
The car averages 70 miles per hour for y hours and averages 55 miles per hour for the rest of the time.
Express the total distance traveled by the car in terms of y.
:
From the information given, we know
Car 1 averaged 70 mph for y hrs
then, since the total travel time is 14 hrs,
car 2 averages 55 mph for (14-y) hrs
:
dist = speed * time
:
d(y) = 70y + 55(14-y)
d(y) = 70y + 770 - 55y
d(y) = 70y - 55y + 770
d(y) = 15y + 770
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