# Aptitude - Boats and Streams

Exercise : Boats and Streams - Data Sufficiency 2

- Boats and Streams - Formulas
- Boats and Streams - General Questions
- Boats and Streams - Data Sufficiency 1
- Boats and Streams - Data Sufficiency 2

*Directions to Solve*

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. |

Answer: Option

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 |

8*y* = 24 + 6*y*

*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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