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
VikaD [51]
3 years ago
14

 The distance between city A and B is 600 km. The first train left A and headed towards B at the speed of 60 km/hour. The secon

d train left B heading towards A three hours after the first train left A, and it traveled with a speed of v km/hour. The trains met t hours after the time at which the first train left A. Express v in terms of t. Find the speed v if t=7; t=6.
Mathematics
1 answer:
hoa [83]3 years ago
8 0
\bf \begin{array}{ccccllll}
&distance&rate(km/hr)&time(hrs)\\
&\textendash\textendash\textendash\textendash\textendash\textendash&\textendash\textendash\textendash\textendash\textendash\textendash\textendash\textendash\textendash\textendash\textendash&\textendash\textendash\textendash\textendash\textendash\textendash\textendash\textendash\textendash\textendash\\
A&d&60&t\\
B&600-d&v&t+3
\end{array}

\bf \textit{meaning}\implies 
\begin{cases}
d=(60)(t)
\\ \quad \\
600-d=(v)(t+3)\\
------------\\
d=\boxed{60t}\qquad thus
\\ \quad \\
600-\boxed{60t}=v(t+3)\leftarrow \textit{solve for "t"}
\end{cases}

keep in mind, that "t" is the time when the train at A station, left towards B station

they met, at some time "t", and by the time that happened, train from A
which started 3 hours earlier, had already covered "d" distance,
whatever that is
and the train coming from B, covered, 600-d, or the difference
You might be interested in
If f(x) = 3x + 1 and f^-1 = x-1/3 , then the ordered pair of f(3) =
Basile [38]

Answer:

10

Step-by-step explanation:

f(x) = 3x + 1

f^-1 = x-1/3 , it is known as inverse function.

f(3)= 3*3 +1

=9+1

=10

To find inverse,

x=3x + 1

y=3x+1

Exchanging the position or x and y

x=3y+1

x-1=3y

.•. y=x-1/3

5 0
2 years ago
Write the equation of a linear function with slope m, initial value b, independent
Mrac [35]

Answer:

y=mx+b

Step-by-step explanation:

4 0
2 years ago
Is 0.08 bigger or smaller than 0.8
harkovskaia [24]
Larger meaning ... say, jessica has 20 cookies noah has 200..... who has more
jessica<noah
3 0
3 years ago
Read 2 more answers
Ummm i don’t understand these I just started can someone help
bixtya [17]

so for question 2 find the area of the rectangle first:

15 \times 19 = 285

then you find the area of the triangles:

15 \times 13 = 195 \\ 195 \div 2 = 97.5

15 \times 11 = 165 \\ 165 \div 2 = 82.5

Add up all the answers:

285 + 97.5 + 82.5 = 465

and for question 3, part A, you just find the area of the 2 boxes and multiply:

5 \times 5 = 25 \\ 25 \times 2 = 50

2 \times 5 = 10 \\ 10 \times 4 = 40

40 + 50 = 90

so the surface area of the box is 90 square inches therefore the paint covered 90 square inches. For part B, just add up the length of the thick black lines:

5 + 5 + 5 + 5 + 2 + 5 + 5 + 5 + 5 + 5 + 5 + 2 + 5 + 5 = 64

How these helped have a good day

8 0
2 years ago
Represent the proportional relationship described with an equation where d equals dogs and c equals cats: three dogs for each ca
amid [387]
The equation would be y= 3d + c
8 0
3 years ago
Other questions:
  • What is the first operation that you will perform when you evaluate this expression? 12 + (18 - 2) x 3 ÷ 24
    11·1 answer
  • Is 34.49 rational or irrational
    15·1 answer
  • The sum of two numbers is 41 . The smaller number is 11 less than the larger number . What are the numbers ?
    7·1 answer
  • The perimeter of the rectangle is 146 units. What is the length of the longer side?
    11·2 answers
  • A torch and a battery cost £2.50 altogether. The torch costs £2.00 more than the battery.
    6·1 answer
  • Bicycle Inc. rents bikes for $11 plus $5 per hour. Maria paid $51 to rent a bike. For how many hours, h, did she rent the bike?
    11·1 answer
  • Jack's house is located at the origin (0,0). He walks 2 blocks right. Then, he walks 6 blocks up. Finally, he walks 3 blocks rig
    13·1 answer
  • Which of the following polynomial functions is graphed below?
    8·2 answers
  • Please solve this it’s due in 2 hours I’ll give brainliest ONLY ANSWER IF YOU KNOW
    5·1 answer
  • Use the figure below to answer the question. What is the measure of ∠ABC? *
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!