# Aptitude - Boats and Streams

### Exercise :: Boats and Streams - Data Sufficiency 2

Each of the questions given below consists of a question followed by three statements. You have to study the question and the statements and decide which of the statement(s) is/are necessary to answer the question.

1.

 What is the speed of the boat in still water? I. The speed downstream is 12 kmph. II. The speed upstream is 4 kmph. III. In a to and fro journey between two points, the average speed of the boat was 6 kmph.

 A. I and II only B. All I, II and III C. III, and either I or II D. Any two of the three E. None of these

Explanation:

 From I and II, speed of boat in still water = 1 (12 + 4) km/hr = 8 km/hr. 2

From II and III, we get:

 Using average speed = 2xy , we get: 2 x 4 x y = 6 x + y 4 + y 8y = 24 + 6y y = 12. Required speed = 1 (12 + 4) km/hr = 8 km/hr. 2

Similarly, I and III also give the answer. Correct answer is (D).

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