# maths

A car completes a trip in 20 minutes. for the first half of the trip the speed of the car was 100km/h and the speed for the second half of the trip was 90km/h. How far did the car travel (in km) if the distance for the first part is the same as the second part

1. 👍 0
2. 👎 0
3. 👁 112
1. Let the total distance be 2d. Then, since time = distance/speed,

d/100 + d/90 = 1/3

1. 👍 0
2. 👎 0
posted by Steve

## Similar Questions

1. ### physical science

A car travels in a northward direction for a total distance of 512 km. The car completes this trip in 6 hrs. After resting the driver makes the return trip, the return trip only takes 5.5 hours. What is the average speed of the

asked by Anonymous on August 21, 2014
2. ### Math

can you help i dnt know what to do so could you tell me how to solve it 1. every weekend, Phil drives from his home to his favorite amusement park, a distance of 60 miles. a. If he averages 40 mph for the first half of the trip,

asked by howard on December 30, 2012
3. ### Physics

A car accelerates from rest at 2.3m/s^2 for 18 seconds, then decelerates to 15 m/s over 301 meters. A) How fast is the car moving at 18seconds? (Is it 2.3 m/s^2) B) How far does the car travel over the entire trip? (The m/s and

asked by Emily on September 2, 2014
4. ### math algebra

A train averaged 80 km/h for the first half of its trip. How fast must it travel for the second half of the trip in order to average 96 km/h for the whole trip? The answer is 120 km/ h but how do i set it up and get there? thanks

asked by grace on January 13, 2008
5. ### math

a round trip car ride took 12 hours. the first half of the trip took 7 hours at a rate of 4 miles per hour. what was the average rate of speed on the return trip? how do i write this as an equation?

asked by Sara! on May 31, 2010
6. ### MATH!

a round trip car ride took 12 hours. the first half of the trip took 7 hours at a rate of 45 miles per hour. what was the average rate of speed on the return trip?

asked by Sara! on May 31, 2010
7. ### math

a round trip car ride took 12 hours. the first half of the trip took 7 hours at a rate of 45 miles per hour. what was the average rate of speed on the return trip?

asked by Sara! on May 31, 2010
8. ### science

A race car travels northward on a straight, level track at a constant speed, traveling 0.777 km in 16.6 sec. The return trip over the same track is made in 21.7 sec. What is the average velocity of the car for the FIRST leg of the

asked by Anonymous on February 5, 2012
9. ### Math

On a business trip a salesman traveled 40 mph for the first third of his trip and 50 mph for the remainder. If the entire trip took 4 hours and 20 minutes, how many miles did he travel? any help is grately appreciated!

asked by Rachel h on September 17, 2007
10. ### physics

During the first 18 minutes of a 1.0-hour trip, a car has an average speed of 11 m/s. What must the average speed of the car be during the last 42 minutes of the trip be if the car is to have an average speed of 21 m/s for the

asked by thaokieu on January 30, 2011

More Similar Questions