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
julia-pushkina [17]
3 years ago
12

Train A has a speed 20 miles per hour greater than that of train B. If train A travels 270 miles in the same times train B trave

ls 210 miles, what are the speeds of the two trains?
Mathematics
1 answer:
Kaylis [27]3 years ago
4 0

Answer:

speed of train A = 70 + 20 = 90 miles per hour

speed of train B = 70 miles per hour 

Step-by-step explanation:

Let

speed of train B = a

speed of train A = a + 20

Recall

speed = distance/time

The travel time is same for both train. Therefore, let us make time subject of the formula in the speed equation.

Time = distance/speed

270/a + 20 = 210/a

cross multiply

270a = 210(a + 20)

270a = 210a + 4200

270a - 210a = 4200

60a = 4200

divide both sides by 60

a = 4200/60

a = 70

speed of train A = 70 + 20 = 90 miles per hour

speed of train B = 70  miles per hour

You might be interested in
12. A professor creates a boxplot of test scores for 26 students in a statistics course. What percentage of students scored abov
WARRIOR [948]

Answer:

25%

Step-by-step explanation:

Based on the boxplot given ;

The boxplot can be summarized as follows :

Lower quartile, Q1 = 50 (starting point of the box)

Median (Q2), 50th percentile = 70 (vertical line in between the box)

The upper quartile marks the 75th percentile, Q3 = 81 (end point of the box)

The total distribution is 100% and hence, the percentage above the score 81 will be :

100% - 75% = 25%

4 0
3 years ago
Find the slope of the line that passes through the pair of points.<br> (6, 1), (-6, 1)
GrogVix [38]

Answer: m = 0

Step-by-step explanation: To find the slope of the line, we can use the graphing method. To do this, we start by plotting our two points.

Let's label (6, 1) as point A and (-6, 1) as point B.

Now, graph our line through the 2 points.

Now remember that the slope, or m, is equal to

the rise over run from point A to point B.

To get from point A to point B, we rise o units and run -12 units.

So our slope or rise / run is 0/-12 which simplifies to 0.

This should make sense because we have a horizontal or flat line and

remember that the slope of any horizontal or flat line is 0.

Image attached.

7 0
2 years ago
Read 2 more answers
The world population is estimated to be nearly 9 billion by the year 2050.
Olin [163]

The world population is estimated to be nearly 9 billion by the year 2050.

Africa- 20%

What is the estimated population of Africa in the year 2050?

9 billion x 0.2 = 1.8 billion

5 0
3 years ago
Graph:<br> Y:3sin(2x-pi/3)-2<br><br> Find max,min,amplitude,horizental shift,and vertical shift)
patriot [66]
Max:
Min:
Amplitude: 3
Horizontal Shift: 0
Vertical Shift: -2

I'm not sure on the max and min, but here is everything else. ^_^
7 0
3 years ago
Write 30/75 in lowest terms
Andrews [41]

Answer:

30/75

(30÷5)/(75÷5)

6/15

(6÷3)/(15÷3)

2/5

= 2/5.

Thank you.

BY GERALD GREAT.

4 0
3 years ago
Other questions:
  • Yolanda scored 3 times as many goals as Xander. Xander scored 4 fewer goals than Yolanda. How many goals did each person score?
    15·2 answers
  • Volume of cylinders formula 4in 6in
    9·1 answer
  • Lee wu writes 48 résumés for $35 each. what is her pay ?
    9·1 answer
  • Given g(x)=3x2+3 find x if g(x)=78 Help me please
    10·2 answers
  • A painter mixed 1/4 quart of red paint with 3/4 blue paint to make purple paint. How much purple paint did the painter make?
    7·2 answers
  • Pls help me!!!!!!???
    13·1 answer
  • 7(5+2c)+3c I need help
    10·2 answers
  • A rectangle has an area of 24 square feet and a length of 6 feet. Calculate the perimeter of the rectangle.
    7·1 answer
  • Help me... I need thae answer.
    5·2 answers
  • HURRY UP ASAP DOING A QUIZ WORTH 32 POINTS Which number line plots the integers –8, –4, and 11?
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!