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snow_tiger [21]
2 years ago
7

The distance between two stations A and B is 100km.If the average speed of a train is increased by 5km/h , the time taken by the

train to travel from A to B would be 10 minutes less.Find the original average speed of the train.
Mathematics
1 answer:
hoa [83]2 years ago
6 0

Answer:

I also occupy it they pass it to me

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A bag contains 6 red balls and 5 black balls . Two balls are picked , one after the other . Find the probability that :
Kaylis [27]

Answer:

<u>There are:</u>

  • 6 red balls - R
  • 5 black balls - B
  • Total number = 11 balls
<h3>A. Without replacement</h3>

i. <u>Two blacks </u>

  • P(BB) = 5/11*4/10 = 2/11

ii. <u>The first is black</u>

  • P(B) = 5/11

or, alternatively

  • P(BR or BB) = 5/11*6/10 + 2/11 = 3/11 + 2/11 = 5/11

iii. <u>Both are of same colour</u>

  • P(BB or RR) = 2/11 + 6/11*5/10 = 2/11 + 3/11 = 5/11
<h3>B. With replacement</h3>

i. <u>Two blacks </u>

  • P(BB) = 5/11*5/11 = 25/121

ii. <u>The first is black</u>

  • P(B) = 5/11

or alternatively

  • P(BR or BB) = 5/11*6/11 + 25/121 = 30/121 + 25/121 = 55/121 = 5/11

iii. <u>Both are of same colour</u>

  • P(BB or RR) = 5/11*5/11 + 6/11*6/11 = 25/121 + 36/121 = 61/121
7 0
3 years ago
Two angles in a triangle add up to 152 degrees. <br>what is the size of the third angle?
Norma-Jean [14]

Answer:

28 degrees

Step-by-step explanation:

A triangle is 180 degrees. 180-152=28.

3 0
2 years ago
Read 2 more answers
The length of a rectangle is three times its width. The perimeter of the rectangle is at most 112cm. Which inequality models the
miss Akunina [59]

Answer: w ≤ 14 cm , L ≤ 42 cm

<u>Step-by-step explanation:</u>

width (w): w

Length(L): 3w

Perimeter (P) = 2w + 2L

P ≤ 112

 2w +   2L   ≤ 112

2(w) + 2(3w) ≤ 112

 2w +   6w   ≤ 112

       8w        ≤ 112

         w        ≤ 14

8 0
3 years ago
The circle has an area of 144 <br><br> What is the radius and diameter
vichka [17]

Answer:

for the radius, the cloest i could get was 6.77. therefore the diametre would be double meaning its would be 13.54

so sorry if this is incorrect!

8 0
2 years ago
Read 2 more answers
Find the sum of -6/ab + a^2/b^2
Ymorist [56]

Answer:

\frac{1}{ab^{2} } (a³ - 6b)

Step-by-step explanation:

\frac{-6}{ab} + \frac{a^{2} }{b^{2} }

= \frac{-6b + a^{3} }{ab^{2} }

= \frac{1}{ab^{2} } (a³ - 6b)

4 0
2 years ago
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