Aptitude - Simplification - Discussion
Discussion Forum : Simplification - General Questions (Q.No. 15)
15.
David gets on the elevator at the 11th floor of a building and rides up at the rate of 57 floors per minute. At the same time, Albert gets on an elevator at the 51st floor of the same building and rides down at the rate of 63 floors per minute. If they continue travelling at these rates, then at which floor will their paths cross ?
Answer: Option
Explanation:
Suppose their paths cross after x minutes.
Then, 11 + 57x = 51 - 63x 
120x = 40
| x = | 1 |
| 3 |
| Number of floors covered by David in (1/3) min. = |  |
1 | x 57 |  |
= 19. |
| 3 |
So, their paths cross at (11 +19) i.e., 30th floor.
Discussion:
28 comments Page 2 of 3.
Mukesh said:
10 years ago
@Mani.
You are cool, this is the best way and the easiest way.
You are cool, this is the best way and the easiest way.
Subhadip said:
1 decade ago
Just visualize the problem solve & understand last step.
Kumar said:
9 years ago
@Mani, How is Y value same for both but different in speeds?
Deepti said:
1 decade ago
Can someone explain how you got 11+(1/3)*57b = b51-(1/3)*63?
Hardik said:
1 decade ago
@Geeni
Please explain last step
11+(1/3)*57=51-(1/3)*63
Please explain last step
11+(1/3)*57=51-(1/3)*63
Raj said:
7 years ago
Thank you so much for explaining the solution of this.
Samiksha said:
7 years ago
Can anybody make me understand this question? Please.
(2)
Akshatha said:
6 years ago
Can anyone tell me the problem meaning step by step?
(3)
Albert Einstein said:
7 years ago
Well said, thanks for your explanation @Radhika K R.
Anil Sah said:
5 years ago
Not understanding, Please anyone help me to get it.
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers