Boats and Streams - General Aptitude

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.
Q1:

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.

A I alone sufficient while II alone not sufficient to answer

B II alone sufficient while I alone not sufficient to answer

C Either I or II alone sufficient to answer

D Both I and II are not sufficient to answer

E Both I and II are necessary to answer

ANS:E - Both I and II are necessary to answer

 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).