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
Andreyy89
3 years ago
10

A train travels 110 km in the same time that a plane covers 385 km. If the speed of the plane is 20 km per hr less than 4 times

the speed of the train, find the speeds.
Trains speed: __ km per hr
Plane's speed — km per hr
Mathematics
2 answers:
Ierofanga [76]3 years ago
8 0

Answer:

Two identical trains, Train A and Train B, are traveling along parallel rails.

The speed of Train A is 88 km/hr, and the speed of Train B is 96 km/hr. Based on this information, which of the following statements is true?

A.

Train B has more kinetic energy than Train A.

B.

Train A has more kinetic energy than Train B.

C.

The trains have the same kinetic energy.

D.

Neither train has any kinetic energy.

Step-by-step explanation:

slamgirl [31]3 years ago
4 0

Answer:

  • train: 40 kph
  • plane: 140 kph

Step-by-step explanation:

Let t represent the speed of the train in km/h. Then 4t-20 is the speed of the plane. Travel times are the same, so we can use the formula ...

  time = distance/speed

and equate the travel times.

  110/t = 385/(4t-20)

Cross multiplying gives ...

  110(4t -20) = 385t

  440t -2200 = 385t . . . . . eliminate parentheses

  55t -2200 = 0 . . . . . . . . . subtract 385t

  t -40 = 0 . . . . . . . . . divide by 55

  t = 40 . . . . . . . . . . . add 40; train's speed is 40 kph

  4t -20 = 140 . . . . . . find plane's speed; 140 kph

The train's speed is 40 km/h; the plane's speed is 140 km/h.

_____

<em>Check</em>

Train's travel time = 110 km/(40 km/h) = 2.75 h.

Plane's travel time = 385 km/(140 km/h) = 2.75 h.

You might be interested in
Im dumb as heck so plez halp​
spayn [35]
The answer is 4
The area is length X width
It is also a square meaning all sides are equal
So with this is mind we can ask the question what times what equals 16 and is the same number
This would be 4 since 4 times 4 is sixteen
4 0
3 years ago
Solve for x. Please look at the picture and answer it. Thank you.
AleksAgata [21]

45+63+(4x-12)= 180°

96+4x = 180°

4x=84

x = 21

8 0
2 years ago
It's the day before Valentine's Day and Shelly needs to get Valentine cards for all of her classmates.The desks are arranged in
Vitek1552 [10]

Answer:

32

Step-by-step explanation:

No of desks along  length of the rectangle = 7 as it is 7 rows wide.

No of desks along  breadth of the rectangle = 7 as it is 5 rows long.

Total number of students is product of these two numbers.

So number of students = 35.

But three desks are empty.

Total students = 35- 3

                         = 32.

4 0
3 years ago
The rectangular area measures 30 ft by 25ft. The fencing that will be used comes in 25 ft sections. How many sections will you n
lbvjy [14]

Answer:

5

Step-by-step explanation:

8 0
3 years ago
Which expressions are equivalent to √/32?<br> 4√8<br> 08<br> 2√8<br> 4√2<br> 16<br> 16√2
vaieri [72.5K]

Answer: 4√2

square root of a number is the factor that we can multiply by itself to get that number.

The square root symbol is also called as a RADICAL.

Perfect squares are the squares of the integers also called as square numbers.

to find the square root of non-perfect squared numbers we have to check the number with a near-perfect squared numbers

how to find square root of non perfect squared numbers:

If we can't figure out what factor multiplied by itself will result in the given number, we can make a factor tree.

Factor tree of 32 = 2*2*2*2*2

                            = (2*2) * (2*2) *2

                            = (4)2 *2

Therefore √/32 = √/2*2*2*2*2

                          = √/(4)2*2

                          = 4√/2

learn more about square roots here:

brainly.com/question/428672

brainly.com/question/3617398

#SPJ9

8 0
2 years ago
Other questions:
  • A party store sells large plates in packs of 12 and small plates of 8 . in order to have an equal number of both , what is the l
    9·1 answer
  • If 12 to 99 power - 12 to 97th power
    9·2 answers
  • The height of a stack of DVD cases is in a proportional relationship to the number of cases in the stack. A stack of cases and i
    11·1 answer
  • Turn 8/20 into a fraction and simply it
    5·2 answers
  • Red Top Cab Company receives multiple complaints per day about driver behavior. Over 9 days the owner recorded the number of cal
    15·1 answer
  • What is 26/4, 6.45, 6 2/5, and 50/8 in order from least to greatest?
    5·1 answer
  • What does x equal ?<br> quick answer!!!
    14·1 answer
  • UHHHHH IM GONNA FAIL MATH YALL<br><br> Just answer it ig-?<br> I WILL MARK AS BRAINLIEST
    7·1 answer
  • A politician running for office called random phone numbers to see what proportion of the vote he could anticipate getting. From
    8·1 answer
  • Mathematics<br> Solve k - 120= 768 Find the value of k
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!