[Download PDF] 2012 RRB Ahmedabad Paper with Solutions

Instructions

For the following questions answer them individually

Question 41

A train of 150 metres crosses a railway bridge in 26 seconds at a speed of 90 km/hr. What is the length of this bridge ?

Video Solution

Solution

90 kmph = 90 * 5 /18 = 25 m/s

(150 + x ) / 26 = 25

So, x = 500 mts

Question 42

$$ \frac{8.73 \times 8.73 \times 8.73 + 4.27 \times 4.27 \times 4.27}{8.73 \times 8.73 -8.73 \times 4.27 + 4.27 \times 4.27} $$ is equal to ----

Video Solution

Solution

($$ a ^ {3} + b ^ {3}$$) / ($$ a ^ {2} - ab + b ^ {2} $$) = a + b

Substituting 8.73 for a and 4.27 for b, we get the answer

Question 43

45 is the average marks obtained by 30 students of a class. On checking, two errors were identified. On correction, one student obtained 45 more marks while other obtained 15 less marks. What is the average of corrected marks ?

Video Solution

Solution

On correction, total increase in marks = 45 - 15 = 30 marks.

Number of students = 30

So, increase in the average = 30/30 = 1 mark.

Question 44

12 is the highest common factor of ‘a’ and ‘b’. ‘a’ and ‘b’ are integers and a > b > 12. What would be the minimum values of (a,b) ?

Video Solution

Solution

Since a > b > 12, a and b can't be equal to 12.

So the answer is 36, 24

Question 45

A and B can complete a piece of work in 6 and 12 days separately. If they work jointly, how long will they take to complete this piece of work ?

Video Solution

Solution

Time taken when they work together = $$ \frac {1}{\frac{1}{6}+\frac{1}{12}}$$

= 4 days

Question 46

$$100 \times 10 - 100 + 2000 \div 100 = ?$$

Video Solution

Solution

By BODMAS, Division and Multiplication will be done before addition and subtraction.

Hence, 100 x 10 - 100 + 2000 / 100 = 1000 - 100 + 20 = 920

Question 47

A man gave $$\frac{1}{4}th$$ part of his property to his daughter $$\frac{1}{2}$$ part to his son and then donated $$\frac{1}{5}th$$ part. Thus how much portion of his property did he give away ?

Video Solution

Solution

1/4 + 1/2 + 1/5 = 19/20

Question 48

5: 18 is the ratio of the length and perimeter of a rectangle. What would be the ratio of its length and breadth ?

Video Solution

Solution

l: 2l + 2b = 5 : 18

l : 2b = 5 : 8

l : b = 5 : 4

Question 49

What is the number, which is when added to 7, 16, 43, 79, these numbers become proportional ?

Video Solution

Solution

When 5 is added, 7, 16, 43, 79 the proportion becomes 12: 21 :: 48 : 84

So that's the answer.

Question 50

Marked price of a dining table is Rs. 6, 000 and its is sold to a customer for Rs. 5, 500. What is discount rate given on that table ?

Video Solution

Solution

Discount rate = 500* 100/6000= 8.33%

CAT Content

2012 RRB Ahmedabad

A train of 150 metres crosses a railway bridge in 26 seconds at a speed of 90 km/hr. What is the length of this bridge ?

$$ \frac{8.73 \times 8.73 \times 8.73 + 4.27 \times 4.27 \times 4.27}{8.73 \times 8.73 -8.73 \times 4.27 + 4.27 \times 4.27} $$ is equal to ----

45 is the average marks obtained by 30 students of a class. On checking, two errors were identified. On correction, one student obtained 45 more marks while other obtained 15 less marks. What is the average of corrected marks ?

12 is the highest common factor of ‘a’ and ‘b’. ‘a’ and ‘b’ are integers and a > b > 12. What would be the minimum values of (a,b) ?

A and B can complete a piece of work in 6 and 12 days separately. If they work jointly, how long will they take to complete this piece of work ?

$$100 \times 10 - 100 + 2000 \div 100 = ?$$

A man gave $$\frac{1}{4}th$$ part of his property to his daughter $$\frac{1}{2}$$ part to his son and then donated $$\frac{1}{5}th$$ part. Thus how much portion of his property did he give away ?

5: 18 is the ratio of the length and perimeter of a rectangle. What would be the ratio of its length and breadth ?

What is the number, which is when added to 7, 16, 43, 79, these numbers become proportional ?

Marked price of a dining table is Rs. 6, 000 and its is sold to a customer for Rs. 5, 500. What is discount rate given on that table ?

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