Answer / jagdeep

two poles of 5m and 7m respetively. a wire is tied from top
of one to bottom of other. at what heightthe two wires will
cross

We will use algebra and an x-y coordinate axis to solve this
problem. Let the pole of 5 m be located at the origin, so
the two ends of that pole are at (0,0) and (0,5). Let the
pole of 7 m be located on the x-axis at a distance of a to
the right of the first pole, so the two ends of that pole
are at (a, 0) and (a,7). The problem does not state the
distance between the poles, so we let that equal an unknown
constant "a" for now. We will find out later that the value
of "a" is irrelevant.

So we want to draw two lines, one from the base of one to
the top of the other and vice versa.

Line 1: Points (0,0) and (a,7)
Slope of line 1: m = 7/a
Intercept of line 1: b = 0
Equation of line 1: y = (7/a) x

Line 2: Points (0,5) and (a,0)
Slope of line 2: m=-5/a
Intercept of line 2: b = 5
Equation of line 2: y = (-5/a)x + 5

The point where these lines meet is the place where the
wires cross!

Solve equation 1 for x:
x = (a/7) y
Substitute this into equation 2:
y = (-5/a) (a/7) y + 5
Notice that a cancels out!
y = (-5/7)y + 5
(12/7) y = 5
12y = 35
y = 35/12 = 2.912

Answer / rohit_allinterview

Can be calculated using similarity properties of triangles.
Steps:
Step1: Treat line AB as pole1 of 5mts.
Step2: Treat line CD as pole2 of 7mts.
Step3: Let E be the intersection of AD and BC.
Step4: Drop E perpendicular to BD at F. EF=? to b calculated
Step5: Trngl EFD and Trng ABD are similar, Hence
AB/EF= BD/FD. ==> 5/EF=BD/FD

So, EF = 5*FD/BD ------> Eq.1

Similarily, considering trngl's CDB, EFB. They are similar.
Hence, CD/EF = BD/BF ===> 7/EF= BD/(BD-FD)

So, EF = 7*(BD-FD)/BD ----> Eq .2

Solve eq 1 and eq 2. i.e., Equate eq 1 and eq 2.

Hence u get 12*FD=7*BD => FD=7*BD/12 -----> Eq 3

Solve Eq 1 and Eq 3. i.e., substitute FD in Eq1.
EF=35/12= 2.916


Plz rate it if it is correct/incorrect. For any
clarification mail me at rohit_vit2020@yahoo.co.in

Answer / kiran

actually we can calcuate base by applying pythagoras thm.
but finding intersection pt. is bit tricky so rohit if u can
clarify your answer post here

Answer / madhu

I think without knowing the distance b/w the two poles, we
cant find intersecting point height.

Answer / karthik

No rope from top of one pole can reach bottom of other..
so we could't calculate the intersection point from ground

Outside a room there are three light switches. Each switch is connected to a different light bulb inside the room. Each of the three switches can be either 'ON' or 'OFF'. You are allowed to set each switch the way you want it, once, and then enter the room. Your task is to then determine which switch controls which bulb. How can you do it?

6 Answers  

Given a sequence of integers, there are a few sequences which result in balanced binary search trees i.e., AVL trees. Write a program that takes a sequence of integers as input and outputs the number of such sequences that result in the balanced binary search trees. Input Format: Single line contains sequence of integers terminated by -1. Output format: Print the number of AVL tree possible from that input sequence. Sample Input: 1 2 3 -1 Sample Output: 2

0 Answers   TCS,

A woman took a certain number of eggs to the market and sold some of them. The next day, through the industry of her hens, the number left over had been doubled, and she sold the same number as the previous day. On the third day the new remainder was tripled, and she sold the same number as before. On the fourth day the remainder was quadrupled, and her sales the same as before. On the fifth day what had been left over were quintupled, yet she sold exactly the same as on all the previous occasions and so disposed of her entire stock. What is the smallest number of eggs she could have taken to market the first day, and how many did she sell daily? Note that the answer is not zero.

2 Answers   Athena Health Care,

Arrange these words into a romantic word D P G E O D S?

5 Answers   Google,

agar aapne kabhi kisi se saccha pyar kiya hai to is gaane ko complete karo K---N -O --H--T - --G--T---I-A J---N T--S-- S----H--

2 Answers  

500 men are arranged in an array of 10 rows and 50 columns according to their heights. Tallest among each row of all are asked to come out. And the shortest among them is A. Similarly after resuming them to their original positions, the shortest among each column are asked to come out. And the tallest among them is B. Now who is taller A or B ?

14 Answers   ANZ, Infosys,

At the Party: 1. There were 9 men and children. 2. There were 2 more women than children. 3. The number of different man-woman couples possible was 24. Note that if there were 7 men and 5 women, then there would have been 35 man-woman couples possible. Also, of the three groups - men, women and children - at the party: 4. There were 4 of one group. 5. There were 6 of one group. 6. There were 8 of one group. Exactly one of the above 6 statements is false. Can you tell which one is false? Also, how many men, women and children are there at the party?

2 Answers  

A cube is divided into 125 pieces.. then four columns are removed then coloured all side black.. i) how many 0 side painted cubes? ii) how many 1 side painted cubes? iii) how many 2 side painted cubes? iV) how many 3 side painted cubes? V) how many 4 side painted cubes?

7 Answers   Stairway Engineering, Tata Elxsi,

To move a safe, two cylindrical steel bars 7 cms in diameter are used as rollers. How far will the safe move forward when the rollers have made one revolution?

9 Answers   IBM,

Write 1111......(243 times) i.e. a 243 digit number with all 1s. Prove that it is divisible by 243.

3 Answers  

dil ke photo me teer kyu hota hai?

27 Answers  

Three men - Sam, Cam and Laurie - are married to Carrie, Billy and Tina, but not necessarily in the same order. Sam's wife and Billy's Husband play Carrie and Tina's husband at bridge. No wife partners her husband and Cam does not play bridge. Who is married to Cam?

3 Answers   Accenture, Misys,