A) 8 hrs 45 min | B) 8 hrs 42 min |

C) 8 hrs | D) 8 hrs 34 min |

Explanation:

Number of pages typed by Adam in 1 hour = = 6

Number of pages typed by Smith in 1 hour = = 8

Number of pages typed by both in 1 hour = (6 + 8) = 14

Time taken by both to type 110 pages = (120 * 1/14) = 8 = 8 hrs 34 min.

A) 4:1 | B) 5:3 |

C) 16:1 | D) 1:16 |

Explanation:

Time taken by 8th tap = = 8 hours

and time taken by 12th tap = = hour

Ratio of time taken by 8th 8th tap and 12th tap = =16:1

Therefore, Ratio of efficiencies of 8th tap and 12th tap =1:16

A) 3 hours | B) 4 hours |

C) 5 hours | D) None of these |

Explanation:

Rate of leakage = 8.33% per hour

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

Time required = 100/25 = 4 hours

A) 4:18 pm | B) 3:09 pm |

C) 12:15 pm | D) 11:09 am |

Explanation:

Efficiency of P= 5%

Efficiency of Q= 4%

Efficiency of R= 2.5%

Efficiency of S= 2%

%

Thus, at 10 am pipe P,Q and R filled 30.5% of the cistern.

Now, the time taken by P,Q,R and S together to fill the remaining capacity of the cistern

= = =5 Hours and 9 minutes(approx)

Therefore, total time =4 hrs + 5hrs 9 mins

= 9 hrs and 9 mins

It means cistern will be filled up at 3:09 pm

A) 50 | B) 40 |

C) 45 | D) 10 |

Explanation:

It can be solved easily through option.

55 = 55 Hence correct

**Alternatively:**

** **

** **=> n= 10

In Both cases total work is 55man-days.

A) 10 | B) 5 |

C) 15 | D) 4 |

Explanation:

Since 20% typists left the job. So, there can be any value which is multiple of 5 i.e, whose 20% is always an integer. Hence, 5 is the least possible value.