# Time and Work Questions

Q:

A) A | B) B |

C) C | D) can't be determined |

Answer & Explanation
Answer: A) A

Explanation:

Explanation:

A + B= 70%

B + C =50%

B= 20% A= 50% and C=30%

Hence A is most efficient

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Q:

A) 18 days | B) 24 days |

C) 30 days | D) 36 days |

Answer & Explanation
Answer: A) 18 days

Explanation:

Explanation:

2(A+B+C)'s 1 day work =

=>(A+B+C)'s 1 day's work=

work done by A,B and C in 10 days=

Remaining work=

A's 1 day's work =

Now, work is done by A in 1 day.

So, work wil be done by A in = 18 days

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Q:

A) 4 days | B) 5 days |

C) 6 days | D) 7 days |

Answer & Explanation
Answer: C) 6 days

Explanation:

Explanation:

Work donee by A and B in the first two hours, working alternatively = First hour A + Second hour B = (1/4) + (1/12) = 1/3.

Thus, the total time required to complete the work = 2 (3) = 6 days

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Q:

A) 3 hours | B) 4 hours |

C) 5 hours | D) None of these |

Answer & Explanation
Answer: B) 4 hours

Explanation:

Explanation:

Rate of leakage = 8.33% per hour

Net efficiency = 50 - (16.66 + 8.33)= 25%

Time required = 100/25 = 4 hours

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