# Time and Work Questions

A) 4 days | B) 6 days |

C) 8 days | D) 10 days |

Explanation:

Ratio of rates of working of A and B =2:1. So, ratio of times taken =1:2

A's 1 day's work=1/9

B's 1 day's work=1/18

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

so, A and B together can finish the work in 6 days

A) 4.5 | B) 5 |

C) 6 | D) 9 1/3 |

Explanation:

A : B : C

Efficiency 10 : 9 : 6

No of days 9x : 10x : 15x

15x-9x = 6

x = 1

Number of days taken b A = 9

Number of days taken by B= 10

Number of days taken by C = 15

work done by B and C in initial 2 days = =

rest work =

Number of days required by A to finish work = = 6 days

A) 27 days | B) 12 days |

C) 25 days | D) 18 days |

Explanation:

x= 20 and x=-14

so, the acceptable values is x=20

Total work = = 18 x 20 =360 unit

Now 360 = 30 x k

k=12 days

A) 1/24 days | B) 7/24 days |

C) 24/7 days | D) 4 days |

Explanation:

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

so, A,B and C together will complete the work in 24/7 days.

A) A | B) B |

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

Explanation:

A + B= 70%

B + C =50%

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

Hence A is most efficient