SOLUTION: Traveling at an average speed of 60 miles per hour can give better gas mileage than traveling at higher speeds. Suppose you drive from one town to another and want to average 60 mi
Algebra.Com
Question 505916: Traveling at an average speed of 60 miles per hour can give better gas mileage than traveling at higher speeds. Suppose you drive from one town to another and want to average 60 miles per hour for the trip. Road construction on the way there reduces your average speed to 30 miles per hour. If you drive 90 miles per hour on the return trip, what is your average speed for the entire trip?
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
Suppose you drive from one town to another and want to average 60 miles per hour for the trip.
Road construction on the way there reduces your average speed to 30 miles per hour.
If you drive 90 miles per hour on the return trip, what is your average speed for the entire trip?
:
Well, you can't average 60 mph on this trip, when you get where you are going, you have already used up the time allotted for the whole trip
:
If you drive 90 on the return trip:
:
Let a = average for the whole trip
Let d = the one-way distance
:
Write a time equation, time = dist/speed
:
go time + return time = total time
+ =
multiply by 90a, results
3da + da = 90(2d)
4da = 180d
divide by d
4a = 180
a =
a = 45 mph average for the round trip
RELATED QUESTIONS
Traveling at an average speed of 60 miles per hour can give better gas mileage than... (answered by scott8148)
a driver wants to gauge the fuel efficiency of her vehicle at speeds of 30mph and above.... (answered by josgarithmetic,MathTherapy)
How far can a car travel if it is traveling at an average speed of 50 miles per hour... (answered by JBarnum)
how far can a car travel in 40 mintues if it is traveling at an average speed of 50 (answered by checkley79)
Train A has a speed 15 miles per hour greater than that of train B. If train A travels... (answered by rothauserc)
how far can a car travel in 40 minutes if it is traveling at an average speed of 50 miles (answered by Alan3354)
How far can a car travel in 40 minutes if it is traveling at an average speed of 50 miles (answered by nerdybill,jim_thompson5910)
how far can a car travel in 40 minutes if it is traveling at an average speed of 50 miles (answered by Alan3354)
Indianapolis is 1000 miles from Amarillo. Andy left Indianapolis, traveling toward... (answered by checkley77)