Aptitude - Time and Distance - Discussion
Discussion Forum : Time and Distance - Data Sufficiency 1 (Q.No. 1)
Directions to Solve
Each of the questions given below consists of a statement and / or a question and two statements numbered I and II given below it. You have to decide whether the data provided in the statement(s) is / are sufficient to answer the given question. Read the both statements and
- Give answer (A) if the data in Statement I alone are sufficient to answer the question, while the data in Statement II alone are not sufficient to answer the question.
- Give answer (B) if the data in Statement II alone are sufficient to answer the question, while the data in Statement I alone are not sufficient to answer the question.
- Give answer (C) if the data either in Statement I or in Statement II alone are sufficient to answer the question.
- Give answer (D) if the data even in both Statements I and II together are not sufficient to answer the question.
- Give answer(E) if the data in both Statements I and II together are necessary to answer the question.
1.
Two towns are connected by railway. Can you find the distance between them? | |
I. | The speed of the mail train is 12 km/hr more than that of an express train. |
II. | A mail train takes 40 minutes less than an express train to cover the distance. |
Answer: Option
Explanation:
Let the distance between the two stations be x km.
I. Then, speed of the mail train = (y + 12) km/hr.
II. | x | - | x | = | 40 | . |
y | (y + 12) | 60 |
Thus, even I and II together do not give x.
Correct answer is (D).
Discussion:
9 comments Page 1 of 1.
Vini said:
1 decade ago
Let speed of express train ,Se= x km/hr
therefore, speed of mail train, Sm= (x+12)km/hr
Let time taken by express train, Te= t hrs
therefore , time taken by mail tain, Tm= t hrs -(40min.)
= t - 40/60
= t-2/3 hrs
Distance= d km
1. d/x = t
2. d/(x+12)= t-2/3
on solving these, we still can not find d (distance), as the equation results in two unknown variables.
12d/(x(x+12)) =2/3 (you can not find distance here)
Thus, correct ans. is Option D
therefore, speed of mail train, Sm= (x+12)km/hr
Let time taken by express train, Te= t hrs
therefore , time taken by mail tain, Tm= t hrs -(40min.)
= t - 40/60
= t-2/3 hrs
Distance= d km
1. d/x = t
2. d/(x+12)= t-2/3
on solving these, we still can not find d (distance), as the equation results in two unknown variables.
12d/(x(x+12)) =2/3 (you can not find distance here)
Thus, correct ans. is Option D
(5)
Gauri said:
5 years ago
@Vinii.
Thanks.
Thanks.
(2)
Rukmangathan R said:
4 years ago
@Prashanth.
While we calculating for hrs we must assign 60 mins.
While we calculating for hrs we must assign 60 mins.
(2)
Rekha said:
6 years ago
I didn't get this answer. Please, anyone, explain this clearly.
(1)
Poojitha said:
1 decade ago
Can any one explain?
Ramu royal said:
1 decade ago
Thank you @vini.
Xyz said:
1 decade ago
Distance of the mail train is 480? can you any tell me is it right or wrong?
Prashanth said:
6 years ago
How you get the 60?
Gopi said:
5 years ago
Please, anyone explain this.
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