Boats and Streams – Data Sufficiency 1
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.
Answer: Option E
Explanation:
I. Speed of the current = 1 km/hr.
II. PQ = 4 km.
Let the speed of the boat in still water be x km/hr. Then,
4  +  4  = 3. This gives x. 
(x + 1)  (x – 1) 
2. 



Answer: Option D
Explanation:
Let AB = x km.
I. Speed downstream =  x  km/hr 
2 
II. Speed upstream =  x  km/hr. 
4 
Speed of boat in still water =  1  x  +  x  
2  2  4 
Thus, I and II both even do not give the answer.
3. 



Answer: Option E
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.