# Algebra

posted by .

1. A car travels 20 kilometers per hour faster than a second car. The first car covers 180 kilometers in the same time the second covers 135 kilometers. What is the average speed of each car?

2. The tens' digit of a two-digit number is one more than its units' digit. If the number is divided by the sum of the digits, the quotient. What is the number?

• Algebra -

1. F-20=S
180=F*t and 135=S*t or 180=F*135/S or
S=135/180 F put that into the first equation.

2. Makes no sense to me.

• Algebra -

speed of 2nd car -- x
speed of 1st car -- x+20

time for 2nd car to go 135 km = 135/x
time for 1st car to go 180 km = 180/(x+20)

but aren't these two the same ?
Continue ....

In the second question, it looks like you did not finish the part where it tells us what the quotient is.

let unit's digit be x
then tens digit is x+1
then the number is 10(x+1) + x = 11x + 10

so (11x+10)/(x+(x+1)) = the quotient

continue

## Similar Questions

1. ### Precalculus

Rosea drives her car 30 kilometers to the train station, where she boards a train to complete her trip. The total trip is 120 kilometers. The average speed of the train is 20 kilometers per hour faster than that of the car. At what …
2. ### physics

A car traveling at 98 kilometers an hour comes to a stop in 15 seconds. What is the car's acceleration in kilometers an hour per second
3. ### Intergated chemistry/physics

The Lamborghini Diablo sports car can accelerate from 0 kilometers/hour to 99.2 kilometers/hour in 4.0 seconds. What is the acceleration of this car in kilometers/hour^2. (hint: you must convert 4.0 seconds before putting it into the …
4. ### math

Currently, the Toyota Corolla is the best selling car in the world. Suppose that during a test drive of two Corollas, one car travels 224 miles in the same time that the second car travels 175 miles. If the speed of the first car is …
5. ### math

Currently, the Toyota Corolla is the best selling car in the world. Suppose that during a test drive of two Corollas, one car travels 224 miles in the same time that the second car travels 175 miles. If the speed of the first car is …
6. ### Math

A family left their house in two cars at the same time. One car traveled an average of 7 miles per hour faster than the order. When the first car arrived at the destination after 5 1/2 hours of driving, both cars had driven 599.5 miles. …
7. ### Algebra

1.A motorcycle has a reserved fuel of 0.5 liter which can be used if it's 3-liter fuel tank is about to be emptied. The motorcycle consumes at most 0.5 liter fuel for every 20 km of travel. a. What mathematical statement represents …
8. ### Algebra

A car leaves a town at 80 kilometers per hour. A second car leaves one hour later. If the second car travels at 125 kilometers per hour, how long will it take the second car to catch up?
9. ### Math

A car is traveling at a rate of 35 meters per second. What is the car's rate in kilometers per hour?
10. ### Algebra

A car is traveling at a rate of 60 miles per hour. What is the car's rate in kilometers per hour?

More Similar Questions