19. A train 130 metres long and travelling at 45 km/hr can cross a bridge in 30 seconds. Find the length of the bridge.

Answer:

245 m.  

Explanation:

Speed =		45 x	5	m/sec	=		25	m/sec.
			18				2

Time = 30 sec.

Let the length of bridge be x metres.

Then,	130 + x	=	25
	30		2

 2(130 + x) = 750

 x = 245 m.

18. Pointing to a lady a person said, "The son of her only brother is the brother of my wife." How is the lady related to the person?

Answer:

Sister of father-in-law 

Explanation:

Brother of person's wife → brother-in-law of the person. Hence, the son of lady's brother is brother-in-law of the person.

Therefore, the brother of the lady is the father-in-law of the person. Hence, the lady is the sister of the person's father-in-law.

17. The angle of elevation of the sun, when the length of the shadow of a tree 3 times the height of the tree, is??

Answer:
30º

Explanation:

Let AB be the tree and AC be its shadow.

Let ACB = .

Then,	AC	=	3          cot  = 3
	AB

  = 30º.

16. Find the output.

int main()
{
int ***r, **q, *p, i=8;
p = &i;
q = &p;
r = &q;
printf("%d, %d, %d\n", *p, **q, ***r);
return 0;
}

Answer:
8,8,8

15. Find the Next no

If
5+3+2=151012 ,
9+2+4=183662.
8+6+3=482466,
5+4+5=202504
then what ll be the answer of
7+2+5=??????

Answer:
143542

Explanation:
a+b+c = (a*b)&(a*c)&reverse[b(a+c)]

14. The sum of a positive number and its reciprocal is thrice d difference of d number and its reciprocal. Find d number?

Answer:
√2 (Root 2)

13. Total monthly salary of 4men and 2women is 46,000. If woman earn 500 more than man, then the salary of woman??

Answer:
Rs. 8000
Explanation:
Let x be salary of man.
y be salary of woman.
Then,
4x+2y=46000
x=y-500.
By solving above 2 equations we get y=8000

12. Find the speed of the 2nd train.

A train 108m long moving at a speed of 50km/hr crosses a train 112m long coming from opposite direction in 6sec.The speed of the 2nd train is??


Answer:
82 km/hr

Explanation:

Let the speed of the second train be x km/hr.

Relative speed	= (x + 50) km/hr
	= (x + 50) x 5 m/sec 18
	= 250 + 5x m/sec. 18

Distance covered = (108 + 112) = 220 m.

	220	= 6
	250 + 5x 18

 250 + 5x = 660

 x = 82 km/hr.

11. Find the direction.

If South-East becomes North, North-East becomes West and so on. What will West become?

Answer: 
South - East

Explanation:

It is clear from the diagrams that new name of West will become South-East.

10. What is the age of the youngest child?

The sum of the ages of 5 children born at the interval of 3 years each is 50 years. What is the age of the youngest child?

Answer: 
4 years.

Explanation:
Let the ages of the children be x, (x + 3), (x + 6), (x + 9) and (x + 12) years.
Then, x + (x + 3) + (x + 6) + (x + 9) + (x + 12) = 50
     =>5x = 20
     =>x = 4.
Therefore, Age of the youngest child = x = 4 years.