Aptitude - Height and Distance - Discussion

Discussion :: Height and Distance - General Questions (Q.No.2)


A man standing at a point P is watching the top of a tower, which makes an angle of elevation of 30° with the man's eye. The man walks some distance towards the tower to watch its top and the angle of the elevation becomes 60°. What is the distance between the base of the tower and the point P?

[A]. 43 units
[B]. 8 units
[C]. 12 units
[D]. Data inadequate
[E]. None of these

Answer: Option D


One of AB, AD and CD must have given.

So, the data is inadequate.

Apalkitam said: (Oct 13, 2010)  
The height of the triangular in the form of the conventional. So it should be larger one.

Anitha Alavala said: (Oct 31, 2010)  
Can you please explain briefly. I am not getting the point.

Raji said: (Jan 6, 2011)  
The distance between the base of the tower and the distance at which the man stands from the pole must be given. Otherwise this problem can not be solved. And hence the answer (D).

Sayan Biswas said: (Sep 28, 2011)  
The problem contains 3 unknown variables in 2 equations. We need another equation to solve it. Hence data inadequate.

Vasundhra said: (Sep 11, 2012)  
If it is given distance between A and C how we will solve the prob?

Jiya said: (Feb 17, 2013)  
This data is insufficient because not any perfect side given. If any perpendicular distance given than solve it otherwise not solve.

Raj said: (Apr 1, 2013)  
What are basic theory to solve height and distance?

Kk Rawat said: (Apr 30, 2015)  
The angle of elevation of the top of a TV tower is from three points a, b, c, in straight line through the foot of the tower are alpha, two alpha, three alpha then the of the tower is?

Ally said: (Nov 29, 2015)  
This question was asked in elitmus where height was given as 8 m.

Koushik said: (Aug 16, 2016)  
Hi, I am not getting this, Can anyone explain briefly?

Janak said: (Sep 22, 2016)  
The height of the tower is 8 m which is actually missing in this question.

Surah Nayak said: (Dec 11, 2016)  
I am not getting this, can anyone explain which is actually missing?

Jignesh Mori said: (Dec 23, 2016)  
Height of the tower or distance between tower and man should be given to solve it.

Amar Ati Kolkata said: (Dec 27, 2016)  
Height of the Tower or Distance travelled by man should be provided to get a solution of this question.

Mayank said: (Jan 4, 2017)  
Point p is not given.

So answer is D.

Mayank said: (Jan 4, 2017)  
Point p is not given.

So answer is D.

Roshan Gaykar said: (Feb 23, 2017)  
As per the Pythagoras.

So, option D is right.

Santosh Kumar said: (Jul 13, 2017)  
No of angle<=no of unknown, hence data in adequate.

Samiran Biswas said: (Jul 23, 2017)  
I can't understand. Please explain this question briefly.

Girish said: (Oct 6, 2017)  
If ab is given. How can it be solved please someone explain it.

Diva said: (Oct 12, 2017)  
Elevation from man's eye so height of the man should also be given.

Karthick said: (Dec 31, 2017)  
I am not getting it, Please explain me.

Swati said: (Apr 24, 2018)  
I am not getting it, please explain in details.

K Santhosh said: (Apr 28, 2018)  
Tel me the length of point of men standing to point A.

Harry Grewal said: (May 6, 2018)  
No, the Information is inadequate. Moreover, the graph is also wrong.

The angle must be made from man's eye, not from the foot. The person is in standing position. Not laying on the ground.

Ankush Sapehia said: (May 10, 2018)  
The Answer is D.

Jhanvi said: (Jun 9, 2018)  
The Answer should be 4 units.

Lokesh said: (Aug 9, 2018)  
Inadequate data. Some distance or meter should be there to predict the answer.

Jaidev said: (Aug 24, 2018)  
No, @Jhanvi.

If you take h as the height of the tower, b as the distance from P to the base of the tower and when the person walks to a new point lets say Q, so take x= distance from Q to base of the tower. Now solving these we have tan30=h/b and tan60=h/x. We are left with 3 unknowns and only two equations. Therefore the solution cannot be found.

Mamta Puri said: (Sep 9, 2018)  
Please explain it briefly.

Deepak said: (May 8, 2019)  
Can you please explain briefly. I am not getting the point.

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