A) Only A is sufficient | B) Only B is sufficient |

C) Both (A) and (B) are sufficient | D) None |

Explanation:

From statement A, we know that Pipe A can fill the tank in 40 hours. However, this information is not sufficient as we do not have the data for Pipe B. Hence, statement A alone cannot answer the given question.

From statement B, we know that Pipe B is one third as efficient as pipe A. However, we do not know the rate at which Pipe A fills the tank. Hence, we will not be able to find the rate at which Pipe B fills the cistern. Therefore, statement B alone is not sufficient to answer the question.

Now, if we combine the two statements, we know that Pipe A take 40 hours to fill the cistern.

Pipe B takes 120 hours to fill the cistern.

If they worked alternately, then either Pipe A could have started the cycle or Pipe B could have started the cycle.

If Pipe A started the sequence of filling alternately, then at the end of two hours, the two pipes together would have filled **1/40 + 1/120 = 1/30** th of the tank in an hour. Or the cistern will fill in 30 hours.

If Pipe B started the sequence, then at the end of 2 hours, the two pipes together would have filled **1/120 + 1/40 = 1/30** th of the tank in an hour. Or the cistern will fill in 30 hours.

As the answer obtained irrespective of which pipe started the sequence is the same, the correct answer is (3) - i.e., both the statement are sufficient to answer the question.

A) Only conclusions I and III follow. | B) Only conclusion II follows. |

C) Only conclusions I and II follow. | D) Only conclusion ITI follows. |

A) Only conclusions I, III and IV follow. | B) Only conclusions I and IV follow. |

C) Only conclusions II and III follow. | D) Only conclusions I and II follow. |

A) Only conclusion I follows | B) Only conclusion II follows |

C) Both conclusions I and II follow | D) Neither conclusion I nor conclusion II follows |

A) Only conclusions I and III follow. | B) Only conclusions II and ITI follow. |

C) Only conclusions I and II follow. | D) All conclusions I, II and ITI follow. |

A) Only statement 2 is sufficient | B) Either statement 1 or 2 is sufficient |

C) Both statement. 1 and 2 are sufficient | D) Only statement 1 is sufficient |

A) All conclusions I, II and III follow | B) Only conclusions II and IIIfollow |

C) Only conclusion II follows | D) Only conclusion III follows |

A) Only conclusion 1 follows | B) All the conclusions follow |

C) Only conclusion 2 follows | D) No conclusion follows |

A) Only conclusion 2 follows. | B) All the conclusions follow. |

C) Only conclusion 1 follows | D) None of the conclusions follows. |