The question 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 statements is/are sufficient to answer the given question. Read the both statements and give answer
What is the speed of a boat ?
I. The boat covers a distance of 48 km in 6 h while running upstream.
II. It covers the same distance in 4h while running downstream.

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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

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.

if the either in Statement-I or Statement-II alone are sufficient to answer the question

if data in both Statement-I and II together are necessary to answer the question

answer is D.

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Detailed Solution

Solution:

$\begin{array}{l} I . S p e e d u p s t r e a m = \frac{48}{6} k m / h r = 8 k m / h r \\ I I . S p e e d d o w n = \frac{48}{4} k m / h r = 12 k m / h r \\ S p e e d o f b o a t = \frac{1}{2} (8 + 12) k m / h r = \frac{1}{2} \times 20 = 10 k m / h r \end{array}$