Aptitude - Boats and Streams - Discussion

Discussion Forum : Boats and Streams - Data Sufficiency 1 (Q.No. 3)
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.

3.

What is the speed of the boat in still water?

I. 

The boat covers a distance of 48 kms in 6 hours while running upstream.

 II. 

The boat covers the same distance in 4 hours while running downstream.

I alone sufficient while II alone not sufficient to answer
II alone sufficient while I alone not sufficient to answer
Either I or II alone sufficient to answer
Both I and II are not sufficient to answer
Both I and II are necessary to answer
Answer: Option
Explanation:

 I. Speed upstream = 48 km/hr = 8 km/hr.
6

II. Speed downstream = 48 km/hr = 12 km/hr.
4

Speed of the boat = 1 (8 + 12) km/hr = 10 km/hr.
2

Thus, I and II together give the answer.

Correct answer is (E).

Discussion:
2 comments Page 1 of 1.

Sunder piichai said:   8 years ago
It asked about the speed of the boat in still water. The options which doesn't provided any answer.

Akhila said:   1 decade ago
In this question it says "What is the speed of the boat in still water?".

It asked about still water, but here it doesn't clearly say whether the given speeds on a river or still water. , in question it says upstream and downstream. Therefore it must be flowing water. Flowing water is much different from still water. If we are to answer this it has to be a relative velocity type or has to say on what point the speeds are taken.

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