1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Jlenok [28]
3 years ago
14

Two trains going in opposite directions leave at the same time. Train B travels 30 mph faster than train A. In 3 hours the train

s are 330 miles apart. Find the speed of each.
Mathematics
1 answer:
insens350 [35]3 years ago
6 0
Using the magic of algebra!:

The time each train goes in 1 hour will be represented as a / b.
b is 30 more than a, so if we add 30 to a it should equal b.
a + 30 = b
In three hours, the trains are 330 miles apart.
Esentially, we're adding up the distance each train goes from the starting point to find the distance between them.
3b + 3a = 330
Now we have a system of equations to solve.
a + 30 = b
3b + 3a = 330
We want to get the variables on seperate sides of the equation for easy solving.
a + 30 = b
3b = 330 - 3a
Then get the value of the one variable the same so we can use the transitive property.
a + 30 = b
b = 110 - a

a + 30 = 110 - a
2a + 30 = 110
2a = 80
a = 40 
mph

(And thus b = 70 mph)
You might be interested in
How to add and subtract radical expressions
Ivanshal [37]
Subtract them left to right

4 0
3 years ago
What would normal body temperature be?
jenyasd209 [6]

Answer: The average normal body temperature is generally accepted as 98.6°F (37°C). Some studies have shown that the "normal" body temperature can have a wide range, from 97°F (36.1°C) to 99°F (37.2°C). A temperature over 100.4°F (38°C) most often means you have a fever caused by an infection or illness.

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
Write an equation of the line that has a slope of 2 and y-intercept 1 in slope-intercept form.
Vlada [557]
Y = mx + b

in this case m = 2 and b = 1 so
equation
y =2x + 1

hope this helps
4 0
3 years ago
Read 2 more answers
Combine the like terms
Aleksandr-060686 [28]
The answer for:

20)
6x-7+6x³-4x-10x³-4-8x - 2x²= −43−22−6−11

19)
8u+6+7u+(-10) + (-5u) + 8= 10+4
4 0
3 years ago
Read 2 more answers
Simplified expression of 7z + 8 + 5z – 5z – 9?
Likurg_2 [28]

Answer:

7z-1 hope this helps

Step-by-step explanation:

6 0
3 years ago
Other questions:
  • You have a part-time job. You earn $7.75 per hour. If you work 20 hours
    13·2 answers
  • Enrique is measuring the mass of a flower petal. Which unit of measurement should he use to eliminate the need to write the valu
    5·2 answers
  • Judith wants to buy her mother flowers. Judith earns $4 dollars a week doing chores. If each flower costs $2, how many flowers c
    8·2 answers
  • cylinder has radius of 6 ft and height of 9 ft. how do you calculate the volume of a cone that fits exactly inside cylinder
    8·1 answer
  • Follow the steps to solve this equation.
    6·2 answers
  • Need solved fast! I can’t do it!!
    11·1 answer
  • I need help please please
    6·1 answer
  • What is the volume of the cone?
    13·1 answer
  • Fully factorise 8p + 12​
    7·2 answers
  • Look at the number line below.
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!