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
Sphinxa [80]
3 years ago
15

Train a has a speed 15 miles per hour greater than that of train

Mathematics
1 answer:
Sonbull [250]3 years ago
6 0

Train a speed = x+15

Train b speed =x

255/x = 300/(x+15)

255(x+15) = 300x

255x +3825 =300x

3825 = 45x

X = 3825/45 =85

<span>Train B  = 85 miles per hour</span>

<span> Train A = 85+15 = 100 miles per hour</span>


You might be interested in
A train travels train travels 288 kilometre at a uniform speed. If the speed had been 4 kilometre per hour more it would have ta
kiruha [24]

Answer:

Let the speed of the train be x km/h.

Case 1:

Distance = 288 km

Speed = x km/h

Time = Distance/Speed

= 288/x h

Case 2:

Distance = 288 km

Speed = (x+4) km/h

Time = 288/x + 4 h

Since 288/x > 288/x + 4

288/x - 288/x+4 = 1

288[1/x - 1/x+4 ] = 1

[ x + 4 - x / x(x + 4) ] = 1/288

[4 / x^2 + 4x ] = 1/288

x^2 + 4x = 1152

x^2 + 4x - 1152 = 0

x^2 + 36x - 32x - 1152 = 0

x(x + 36) - 32(x + 36) = 0

(x + 36)(x - 32) = 0

x + 36 = 0 , x - 32 = 0

x = -36 , x = 32

x = -36 , rejected since speed cannot be negative.

Therefore , speed of the train = 32 km/h

4 0
3 years ago
PLEASE HELP ASAP<br> could i just count the squares to get the right answer
natulia [17]

Answer:

a)20 is the answers for the question

Step-by-step explanation:

please give me brainlest and follow me

6 0
2 years ago
Which two numbers go into the blanks so they add to be the bottom number but also multiply to be the top?
ss7ja [257]

Answer:

8 and 6

Step-by-step explanation:

8 * 6 = 48

8 + 6 = 14

5 0
3 years ago
Read 2 more answers
Find the measure of angle b.<br> 29<br> m/B=
rjkz [21]
B is equal to 51 because angles in a right angle add up to 90
7 0
3 years ago
Read 2 more answers
Let $r$ and $s$ be the roots of $3x^2 + 4x - 12 = 0.$ Find $r^2 + s^2.$
Paul [167]

We can factorize the quadratic as

3x^2 + 4x - 12 = 3 (x - r) (x - s)

and expand the right side to get

3x^2 + 4x - 12 = 3x^2 - 3(r + s) x + 3rs

\implies r + s = -\dfrac43 \text{ and } rs = -4

Then we find

(r + s)^2 = r^2 + 2rs + s^2 \implies r^2 + s^2 = \left(-\dfrac43\right)^2 - 2(-4) = \boxed{\dfrac{88}9}

8 0
2 years ago
Other questions:
  • Which of the following is the solution to the inequality below ? -6/5(4-x)&lt;_-4(X+1/2)
    13·1 answer
  • 74-25=59 a84+25=109 b59+25=84 c84+59=143​
    9·1 answer
  • There are 51 students in the orchestra and twice that number in band. There are 19 boys and 13 girls in the choir. If each stude
    14·1 answer
  • -1+8v=2+8v what is the value of v?
    12·1 answer
  • What two number multiplies to -24 and add up to 10
    15·1 answer
  • The flower shop receives a rose delivery every 4 days. Every 10 days, the shop gets other supplies, such as vases, ribbons, and
    13·1 answer
  • Quadrilateral OPQR is inscribed in circle N, as shown below. Which of the following could be used to calculate the measure of ∠O
    12·2 answers
  • What is the height of the cone
    14·1 answer
  • Find square root of 82369 by division method step by step​
    12·1 answer
  • F(x) = -22 + x + 14<br> Find f(2)
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!